SmartFinancial (SMBK) 10-K 16 Mar 18 2017 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Mar. 01, 2018	Jun. 30, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Entity Registrant Name	SMARTFINANCIAL INC.
Entity Central Index Key	1,038,773
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Smaller Reporting Company
Entity Public Float			$ 169.4
Trading Symbol	SMBK
Entity Common Stock, Shares Outstanding		11,229,306

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($)	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Cash and due from banks	$ 64,097,287	$ 34,290,617
Interest-bearing deposits at other financial institutions	41,965,597	34,457,691
Federal funds sold	6,964,000	0
Total cash and cash equivalents	113,026,884	68,748,308
Securities available for sale	151,944,567	129,421,914
Restricted investments, at cost	6,430,700	5,627,950
Loans, net of allowance for loan losses of $5,860,291 in 2017 and $5,105,255 in 2016	1,317,397,909	808,271,003
Bank premises and equipment, net	43,000,249	30,535,594
Foreclosed assets	3,254,392	2,386,239
Goodwill and core deposit intangible, net	50,836,840	6,635,655
Cash surrender value of life insurance	21,646,894	1,320,723
Other assets	13,232,247	9,508,899
Total assets	1,720,770,682	1,062,456,285
Deposits:
Noninterest-bearing demand deposits	220,520,287	153,482,650
Interest-bearing demand deposits	231,643,508	162,702,457
Money market and savings deposits	543,644,830	274,604,724
Time deposits	442,774,094	316,275,340
Total deposits	1,438,582,719	907,065,171
Securities sold under agreement to repurchase	24,054,730	26,621,984
Federal Home Loan Bank advances and other borrowings	43,600,000	18,505,390
Accrued expenses and other liabilities	8,681,393	5,023,600
Total liabilities	1,514,918,842	957,216,145
Stockholders' equity:
Preferred stock - $1 par value; 2,000,000 shares authorized; None issued and outstanding as of December 31, 2017; 12,000 issued and outstanding in 2016	0	12,000
Common stock - $1 par value; 40,000,000 shares authorized; 11,152,561 and 5,896,033 shares issued and outstanding in 2017 and 2016, respectively	11,152,561	5,896,033
Additional paid-in capital	174,008,753	83,463,051
Retained earnings	21,888,575	16,871,296
Accumulated other comprehensive loss	(1,198,049)	(1,002,240)
Total stockholders' equity	205,851,840	105,240,140
Total liabilities and stockholders' equity	$ 1,720,770,682	$ 1,062,456,285

Consolidated Balance Sheets _Pa

Consolidated Balance Sheets [Parenthetical] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Allowance for loan losses (in dollars)	$ 5,860	$ 5,105
Preferred Stock, Par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	0	12,000
Preferred stock, shares outstanding	0	12,000
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	11,152,561	5,896,033
Common stock, shares outstanding	11,152,561	5,896,033

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
INTEREST INCOME
Loans, including fees	$ 48,805,647	$ 39,763,582
Securities and interest bearing deposits at other financial institutions	2,862,825	2,553,652
Federal funds sold and other earning assets	353,924	247,157
Total interest income	52,022,396	42,564,391
INTEREST EXPENSE
Deposits	5,518,350	4,105,304
Securities sold under agreements to repurchase	61,933	65,276
Federal Home Loan Bank advances and other borrowings	113,070	129,102
Total interest expense	5,693,353	4,299,682
Net interest income before provision for loan losses	46,329,043	38,264,709
Provision for loan losses	782,687	787,545
Net interest income after provision for loan losses	45,546,356	37,477,164
NONINTEREST INCOME
Customer service fees	1,374,068	1,127,814
Gain on sale of securities	143,508	199,587
Gain on sale of loans and other assets	1,275,925	948,080
(Loss) gain on sale of foreclosed assets	(47,795)	191,050
Other noninterest income	2,233,787	1,716,794
Total noninterest income	4,979,493	4,183,325
NONINTEREST EXPENSES
Salaries and employee benefits	20,743,153	17,715,222
Net occupancy and equipment expense	4,271,289	3,995,631
Depository insurance	465,844	605,917
Foreclosed assets	83,908	236,148
Advertising	637,600	615,751
Data processing	1,875,462	1,893,386
Professional services	2,084,735	2,122,845
Amortization of intangible assets	346,435	305,452
Service contracts	1,398,018	1,154,003
Merger expenses	2,417,070	0
Other operating expenses	4,758,480	3,855,246
Total noninterest expenses	39,081,994	32,499,601
Income before income tax expense	11,443,855	9,160,888
Income tax expense	6,428,791	3,362,080
Net income	5,015,064	5,798,808
Preferred stock dividends	195,000	1,022,000
Net income available to common stockholders	$ 4,820,064	$ 4,776,808
EARNINGS PER COMMON SHARE
Basic (in dollars per share)	$ 0.56	$ 0.82
Diluted (in dollars per share)	$ 0.55	$ 0.78
Weighted average common shares outstanding
Basic (in shares)	8,639,212	5,838,574
Diluted (in shares)	8,793,527	6,118,943

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 5,015,064	$ 5,798,808
Other comprehensive loss, net of tax:
Unrealized holding gains (losses) arising during the year, net of tax expense (benefit) of $55,405 and $(326,697) in 2017 and 2016, respectively	90,381	(526,954)
Reclassification adjustment for gains included in net income, net of tax expense of $54,533 and $76,422 in 2017 and 2016, respectively	(88,975)	(123,165)
Total other comprehensive loss	1,406	(650,119)
Effect of tax rate change on unrealized gains (losses) on available for sale securities	(197,215)	0
Total other comprehensive loss	(195,809)	(650,119)
Comprehensive income	$ 4,819,255	$ 5,148,689

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income [Parenthetical] - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Unrealized holding losses arising during the year, tax benefit	$ 55,405	$ (326,697)
Reclassification adjustment for gains included in net income, tax expense	$ 54,533	$ 76,422

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($)	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]
BALANCE at Dec. 31, 2015	$ 100,176,859	$ 12,000	$ 5,806,477	$ 82,616,015	$ 12,094,488	$ (352,121)
BALANCE (in shares) at Dec. 31, 2015		12,000	5,806,477
Net income	5,798,808				5,798,808
Other comprehensive gain	(650,119)					(650,119)
Exercise of stock options	803,957		$ 89,556	714,401
Exercise of stock options (in shares)		0	89,556
Dividends on preferred stock	(1,022,000)				(1,022,000)
Stock option compensation expense	132,635			132,635
BALANCE at Dec. 31, 2016	105,240,140	$ 12,000	$ 5,896,033	83,463,051	16,871,296	(1,002,240)
BALANCE (in shares) at Dec. 31, 2016		12,000	5,896,033
Net income	5,015,064				5,015,064
Other comprehensive gain	1,406					1,406
Reclassification adjustment for tax rate change	0				197,215	(197,215)
Issuance of common stock	32,934,676		$ 1,840,000	31,094,676
Issuance of common stock (in shares)			1,840,000
Issuance of stock grants	31,791		$ 1,511	30,280
Issuance of stock grants (in shares)			1,511
Redemption of preferred stock	(12,000,000)	$ (12,000)		(11,988,000)
Redemption of preferred stock (in shares)		(12,000)
Conversion shares issued to shareholders of Capstone Bancshares, Inc.	69,783,821		$ 2,908,094	66,875,727
Conversion shares issued to shareholders of Capstone Bancshares, Inc. (in shares)			2,908,094
Exercise of stock options	4,885,646		$ 506,923	4,378,723
Exercise of stock options (in shares)		0	506,923
Dividends on preferred stock	(195,000)				(195,000)
Restricted stock compensation expense	56,330			56,330
Stock option compensation expense	97,966			97,966
BALANCE at Dec. 31, 2017	$ 205,851,840	$ 0	$ 11,152,561	$ 174,008,753	$ 21,888,575	$ (1,198,049)
BALANCE (in shares) at Dec. 31, 2017		0	11,152,561

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 5,015,064	$ 5,798,808
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,464,414	2,189,088
Provision for loan losses	782,687	787,545
Stock option compensation expense	97,966	132,635
Restricted stock compensation expense	56,330	0
Net gains from sale of securities	(143,508)	(199,587)
Net gains from sale of loans and other assets	(1,275,925)	(948,080)
Net losses (gains) from sale of foreclosed assets	47,795	(191,050)
Changes in other assets and liabilities:
Accrued interest receivable	(331,347)	110,952
Accrued interest payable	31,488	(8,373)
Other assets and liabilities	(102,663)	3,918,803
Net cash provided by operating activities	6,642,301	11,590,741
CASH FLOWS FROM INVESTING ACTIVITIES, net of acquisitions
Purchase of securities available for sale	(53,998,043)	(22,111,781)
Proceeds from security sales, maturities, and paydowns	82,636,066	57,495,436
Purchase (redemption) of restricted investments	246,350
Purchase (redemption) of restricted investments		(1,176,900)
Purchase of bank owned life insurance	(10,000,000)	0
Loan originations and principal collections, net	(72,126,299)	(82,804,921)
Purchase of bank premises and equipment	(2,798,898)	(6,994,729)
Proceeds from sale of foreclosed assets	82,864	1,279,554
Net cash and cash equivalents paid in business combinations	(178,312)	0
Net cash used in investing activities	(56,136,272)	(54,313,341)
CASH FLOWS FROM FINANCING ACTIVITIES, net of acquisitions
Net increase in deposits	50,474,866	48,582,620
Net decrease in securities sold under agreements to repurchase	(2,567,254)	(1,446,231)
Issuance of common stock	37,852,113	803,957
Payment of dividends on preferred stock	(195,000)	(752,000)
Redemption of preferred stock	(12,000,000)	0
Repayment of Federal Home Loan Bank advances and other borrowings	(119,196,383)	(67,282,071)
Proceeds from Federal Home Loan Bank advances and other borrowings	139,404,205	51,600,000
Net cash provided by financing activities	93,772,547	31,506,275
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	44,278,576	(11,216,325)
CASH AND CASH EQUIVALENTS, beginning of year	68,748,308	79,964,633
CASH AND CASH EQUIVALENTS, end of year	113,026,884	68,748,308
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid during the period for interest	5,399,749	4,308,055
Cash paid during the period for taxes	3,531,984	3,754,784
Cash received during the period from tax refunds	0	1,592,224
NONCASH INVESTING AND FINANCING ACTIVITIES
Change in unrealized losses on securities available for sale	(2,276)	1,053,238
Acquisition of real estate through foreclosure	588,775	1,431,857
Financed sales of foreclosed assets	$ 0	$ 3,315,064

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Nature of Business: SmartFinancial, Inc. (the " Company ") is a bank holding company whose principal activity is the ownership and management of its wholly-owned subsidiary, SmartBank (the " Bank "). The Company provides a variety of financial services to individuals and corporate customers through its offices in Tennessee, Alabama, Florida, and Georgia. The Company's primary deposit products are interest-bearing demand deposits and certificates of deposit. Its primary lending products are commercial, residential, and consumer loans. On May 22, 2017, the Company along with the Bank entered into an agreement and plan of merger with Capstone Bancshares, Inc., an Alabama corporation and Capstone Bank, an Alabama-chartered commercial bank and wholly owned subsidiary of Capstone Bancshares, Inc. which became effective on November 1, 2017. Basis of Presentation and Accounting Estimates: The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiary. All significant intercompany balances and transactions have been eliminated in consolidation. In preparing the consolidated financial statements in conformity with accounting principles generally accepted in the United States of America, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet, and reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for loan losses, the valuation of foreclosed assets and deferred taxes, other than temporary impairments of securities, and the fair value of financial instruments. The determination of the adequacy of the allowance for loan losses is based on estimates that are particularly susceptible to significant changes in the economic environment and market conditions. In connection with the determination of the estimated losses on loans, management obtains independent appraisals for significant collateral. The Company's loans are generally secured by specific items of collateral including real property, consumer assets, and business assets. Although the Company has a diversified loan portfolio, a substantial portion of its debtors' ability to honor their contracts is dependent on local economic conditions. While management uses available information to recognize losses on loans, further reductions in the carrying amounts of loans may be necessary based on changes in local economic conditions. In addition, regulatory agencies, as an integral part of their examination process, periodically review the estimated losses on loans. Such agencies may require the Company to recognize additional losses based on their judgments about information available to them at the time of their examination. Because of these factors, it is reasonably possible that the estimated losses on loans may change materially in the near term. The Company has evaluated subsequent events for potential recognition and/or disclosure in the consolidated financial statements and accompanying notes included in this Annual Report through the date of the issued consolidated financial statements. Cash and Cash Equivalents: For purposes of reporting consolidated cash flows, cash and due from banks includes cash on hand, cash items in process of collection and amounts due from banks. Cash and cash equivalents also includes interest-bearing deposits in banks and federal funds sold. Cash flows from loans, federal funds sold, securities sold under agreements to repurchase and deposits are reported net. Cash and Cash Equivalents (continued): The Bank is required to maintain average balances in cash or on deposit with the Federal Reserve Bank. The reserve requirement was $16,546,000 and $15,208,000 at December 31, 2017 and 2016 , respectively. The Company places its cash and cash equivalents with other financial institutions and limits the amount of credit exposure to any one financial institution. From time to time, the balances at these financial institutions exceed the amount insured by the Federal Deposit Insurance Corporation. The Company has not experienced any losses on these accounts and management considers this to be a normal business risk. Securities: Management has classified all securities as available for sale. Securities available for sale are recorded at fair value, with unrealized gains and losses excluded from earnings and reported in other comprehensive loss. Purchase premiums and discounts are recognized in interest income using the interest method over the terms of the securities. Gains and losses on the sale of securities are recorded on the trade date and are determined using the specific identification method. The Company evaluates investment securities quarterly for other than temporary impairment using relevant accounting guidance specifying that (a) if the Company does not have the intent to sell a debt security prior to recovery and (b) it is more likely than not that it will not have to sell the debt security prior to recovery, the security would not be considered other than temporarily impaired unless a credit loss has occurred in the security. If management does not intend to sell the security and it is more likely than not that they will not have to sell the security before recovery of the cost basis, management will recognize the credit component of an other-than- temporary impairment of a debt security in earnings and the remaining portion in other comprehensive loss. Securities borrowed or purchased under agreements to resell and securities loaned or sold under agreements to repurchase are treated as collateralized financial transactions. These agreements are recorded at the amount at which the securities were acquired or sold plus accrued interest. It is the Company's policy to take possession of securities purchased under resale agreements. The market value of these securities is monitored, and additional securities are obtained when deemed appropriate to ensure such transactions are adequately collateralized. The Company also monitors its exposure with respect to securities sold under repurchase agreements, and a request for the return of excess securities held by the counterparty is made when deemed appropriate. Restricted - Investments: The Company is required to maintain an investment in capital stock of various entities. Based on redemption provisions of these entities, the stock has no quoted market value and is carried at cost. At their discretion, these entities may declare dividends on the stock. Management reviews for impairment based on the ultimate recoverability of the cost basis in these stocks. Loans: Loans that management has the intent and ability to hold for the foreseeable future or until maturity or pay-off are reported at their outstanding principal balances less deferred fees and costs on originated loans and the allowance for loan losses. Interest income is accrued on the outstanding principal balance. Loan origination fees, net of certain direct origination costs of consumer and installment loans are recognized at the time the loan is placed on the books. Loan origination fees for all other loans are deferred and recognized as an adjustment of the yield over the life of the loan using the straight-line method without anticipating prepayments. The accrual of interest on loans is discontinued when, in management's opinion, the borrower may be unable to meet payments as they become due, or at the time the loan is 90 days past due, unless the loan is well-secured and in the process of collection. Unsecured loans are typically charged off no later than 120 days past due. Past due status is based on contractual terms of the loan. In all cases, loans are placed on nonaccrual or charged-off at an earlier date if collection of principal and interest is considered doubtful. All interest accrued but not collected for loans that are placed on nonaccrual or charged off is reversed against interest income or charged to the allowance, unless management believes that the accrual of interest is recoverable through the liquidation of collateral. Interest income on nonaccrual loans is recognized on the cash basis, until the loans are returned to accrual status. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and the loan has been performing according to the contractual terms for a period of not less than six months. Acquired Loans: Acquired loans are those acquired in business combinations by the Company or Bank. The fair values of acquired loans with evidence of credit deterioration, purchased credit impaired loans (“ PCI loans ”), are recorded net of a nonaccretable discount and accretable discount. Any excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable discount and is recognized in interest income over the remaining life of the loan when there is reasonable expectation about the amount and timing of such cash flows. The difference between contractually required payments at acquisition and the cash flows expected to be collected at acquisition is the nonaccretable discount, which is included in the carrying amount of acquired loans. Subsequent decreases to the expected cash flows will generally result in a provision for loan losses. Subsequent increases in cash flows result in a reversal of the provision for loan losses to the extent of prior charges or a reclassification of the difference from nonaccretable to accretable with a positive impact on the accretable discount. Acquired loans are initially recorded at fair value at acquisition date. Accretable discounts related to certain fair value adjustments are accreted into income over the estimated lives of the loans. The Company accounts for performing loans acquired in the acquisition using the expected cash flows method of recognizing discount accretion based on the acquired loans' expected cash flows. Management recasts the estimate of cash flows expected to be collected on each acquired impaired loan pool periodically. If the present value of expected cash flows for a pool is less than its carrying value, an impairment is recognized by an increase in the allowance for loan losses and a charge to the provision for loan losses. If the present value of expected cash flows for a pool is greater than its carrying value, any previously established allowance for loan losses is reversed and any remaining difference increases the accretable yield which will be taken into interest income over the remaining life of the loan pool. Acquired impaired loans are generally not subject to individual evaluation for impairment and are not reported with impaired loans, even if they would otherwise qualify for such treatment. Purchased performing loans are recorded at fair value, including a credit discount. Credit losses on acquired performing loans are estimated based on analysis of the performing portfolio. Such estimated credit losses are recorded as nonaccretable discounts in a manner similar to purchased impaired loans. The fair value discount other than for credit loss is accreted as an adjustment to yield over the estimated lives of the loans. A provision for loan losses is recorded for any deterioration in these loans subsequent to the acquisition. Allowance for Loan Losses: The allowance for loan losses is established as losses are estimated to have occurred through a provision for loan losses charged to expense. Loan losses are charged against the allowance when management believes the uncollectibility of a loan balance is confirmed. Confirmed losses are charged off immediately. Subsequent recoveries, if any, are credited to the allowance. The allowance is an amount that management believes will be adequate to absorb estimated losses relating to specifically identified loans, as well as probable credit losses inherent in the balance of the loan portfolio. The allowance for loan losses is evaluated on a regular basis by management and is based upon management's periodic review of the uncollectibility of loans in light of historical experience, the nature and volume of the loan portfolio, overall portfolio quality, review of specific problem loans, current economic conditions that may affect the borrower's ability to pay, estimated value of any underlying collateral and prevailing economic conditions. This evaluation is inherently subjective as it requires estimates that are susceptible to significant revision as more information becomes available. This evaluation does not include the effects of expected losses on specific loans or groups of loans that are related to future events or expected changes in economic conditions. While management uses the best information available to make its evaluation, future adjustments to the allowance may be necessary if there are significant changes in economic conditions. In addition, regulatory agencies, as an integral part of their examination process, periodically review the Company's allowance for loan losses, and may require the Company to make additions to the allowance based on their judgment about information available to them at the time of their examinations. The allowance consists of specific and general components. The specific component relates to loans that are classified as impaired. For impaired loans, an allowance is established when the discounted cash flows, collateral value, or observable market price of the impaired loan is lower than the carrying value of that loan. The general component covers non-impaired loans and is based on the Company's historical loss experience adjusted for other qualitative factors. Other adjustments may be made to the allowance for pools of loans after an assessment of internal or external influences on credit quality that are not fully reflected in the historical loss or risk rating data. Allowance for Loan Losses (continued): An unallocated component may be maintained to cover uncertainties that could affect management's estimate of probable losses. The unallocated component of the allowance reflects the margin of imprecision inherent in the underlying assumptions used in the methodologies for estimating specific and general losses in the portfolio. As part of the risk management program, an independent review is performed on the loan portfolio, which supplements management’s assessment of the loan portfolio and the allowance for loan losses. The result of the independent review is reported directly to the Audit Committee of the Board of Directors. Loans, for which the terms have been modified at the borrower's request, and for which the borrower is experiencing financial difficulties, are considered troubled debt restructurings and classified as impaired. A loan is considered impaired when it is probable, based on current information and events, the Company will be unable to collect all principal and interest payments due in accordance with the contractual terms of the loan agreement. Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest when due. Loans that experience insignificant payment delays and payment shortfalls are not classified as impaired. Impaired loans are measured by either the present value of expected future cash flows discounted at the loan's effective interest rate, the loan's obtainable market price, or the fair value of the collateral if the loan is collateral dependent. Interest on accruing impaired loans is recognized as long as such loans do not meet the criteria for nonaccrual status. Large groups of smaller balance homogeneous loans are collectively evaluated for impairment. The Company's homogeneous loan pools include consumer real estate loans, commercial real estate loans, construction and land development loans, commercial and industrial loans, and consumer and other loans. The general allocations to these loan pools are based on the historical loss rates for specific loan types and the internal risk grade, if applicable, adjusted for both internal and external qualitative risk factors. The qualitative factors considered by management include, among other factors, (1) changes in local and national economic conditions; (2) changes in asset quality; (3) changes in loan portfolio volume; (4) the composition and concentrations of credit; (5) the impact of competition on loan structuring and pricing; (6) the impact of interest rate changes on portfolio risk and (7) effectiveness of the Company's loan policies, procedures and internal controls. The total allowance established for each homogeneous loan pool represents the product of the historical loss ratio adjusted for qualitative factors and the total dollar amount of the loans in the pool. Troubled Debt Restructurings: The Company designates loan modifications as troubled debt restructurings ("TDRs") when for economic and legal reasons related to the borrower's financial difficulties, it grants a concession to the borrower that it would not otherwise consider. TDRs can involve loans remaining on nonaccrual, moving to nonaccrual, or continuing on accrual status, depending on the individual facts and circumstances of the borrower. In circumstances where the TDR involves charging off a portion of the loan balance, the Company typically classifies these restructurings as nonaccrual. In connection with restructurings, the decision to maintain a loan that has been restructured on accrual status is based on a current, well documented credit evaluation of the borrower's financial condition and prospects for repayment under the modified terms. This evaluation includes consideration of the borrower's current capacity to pay, which among other things may include a review of the borrower's current financial statements, an analysis of global cash flow sufficient to pay all debt obligations, a debt to income analysis, and an evaluation of secondary sources of payment from the borrower and any guarantors. This evaluation also includes an evaluation of the borrower's current willingness to pay, which may include a review of past payment history, an evaluation of the borrower's willingness to provide information on a timely basis, and consideration of offers from the borrower to provide additional collateral or guarantor support. The credit evaluation also reflects consideration of the borrower's future capacity and willingness to pay, which may include evaluation of cash flow projections, consideration of the adequacy of collateral to cover all principal and interest, and trends indicating improving profitability and collectability of receivables. Restructured nonaccrual loans may be returned to accrual status based on a current, well-documented credit evaluation of the borrower's financial condition and prospects for repayment under the modified terms. This evaluation must include consideration of the borrower's sustained historical repayment for a reasonable period, generally a minimum of six months, prior to the date on which the loan is returned to accrual status. Foreclosed Assets: Foreclosed assets acquired through, or in lieu of, loan foreclosure are held for sale and are initially recorded at fair value less selling costs. Any write-down to fair value at the time of transfer to foreclosed assets is charged to the allowance for loan losses. Subsequent to foreclosure, valuations are periodically performed by management and the assets are carried at the lower of carrying amount or fair value less costs to sell. Costs of improvements are capitalized, whereas costs relating to holding foreclosed assets and subsequent write-downs to the value are expensed. The amount of residential real estate where physical possession had been obtained included within foreclosed assets at December 31, 2017 and 2016 was $545,750 and $1,500 , respectively. The amount of residential real estate in process of foreclosure at December 31, 2017 and December 31, 2016 was $0 . Premises and Equipment: Land is carried at cost. Premises and equipment are carried at cost less accumulated depreciation computed on the straight-line method over the estimated useful lives of the assets or the expected terms of the leases, if shorter. Expected terms include lease option periods to the extent that the exercise of such options is reasonably assured. Maintenance and repairs are expensed as incurred while major additions and improvements are capitalized. Gains and losses on dispositions are included in current operations. Buildings and leasehold improvements 15 - 40 years Furniture and equipment 3-7 years Goodwill and Intangible Assets: Goodwill represents the cost in excess of the fair value of net assets acquired (including identifiable intangibles) in transactions accounted for as business combinations. Goodwill has an indefinite useful life and is evaluated for impairment annually, or more frequently if events and circumstances indicate that the asset might be impaired. FASB ASC 350, Goodwill and Other , regarding testing goodwill for impairment provides an entity the option to first perform a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If an entity does a qualitative assessment and determines that this is the case, or if a qualitative assessment is not performed, it is required to perform additional goodwill impairment testing to identify potential goodwill impairment and measure the amount of goodwill impairment loss to be recognized for that reporting unit (if any). Based on a qualitative assessment, if an entity determines that the fair value of a reporting unit is more than its carrying amount, the two-step goodwill impairment test is not required. The Company performs its annual goodwill impairment test as of December 31 of each year. For 2017 , the results of the qualitative assessment provided no indication of potential impairment. Goodwill will continue to be monitored for triggering events that may indicate impairment prior to the next scheduled annual impairment test. Intangible assets consist of core deposit premiums created as a result of Business Combinations by the Company or Bank where deposits are assumed. The core deposit premium is initially recognized based on a valuation performed as of the consummation date. The core deposit premium is amortized over the average remaining life of the acquired customer deposits. Amortization expense relating to these intangible assets was $346,435 and $305,452 for the years ended December 31, 2017 and 2016 , respectively. The intangible assets were evaluated for impairment as of December 31, 2017 , and based on that evaluation it was determined that there was no impairment. Transfer of Financial Assets: Transfers of financial assets are accounted for as sales, when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company - put presumptively beyond the reach of the transferor and its creditors, even in bankruptcy or other receivership, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity or the ability to unilaterally cause the holder to return specific assets. Advertising Costs: The Company expenses all advertising costs as incurred. Advertising expense was $637,600 and $615,751 for the years ended December 31, 2017 and 2016 , respectively. Income Taxes: The income tax accounting guidance results in two components of income tax expense: current and deferred. Current income tax expense reflects taxes to be paid or refunded for the current period by applying the provisions of the enacted tax law to the taxable income or excess of deductions over revenues. The Company determines deferred income taxes using the liability (or balance sheet) method. Under this method, the net deferred tax asset or liability is based on the tax effects of the differences between the book and tax bases of assets and liabilities, and enacted changes in tax rates and laws are recognized in the period in which they occur. Deferred income tax expense results from changes in deferred tax assets and liabilities between periods. Deferred tax assets are recognized if it is more likely than not, based on the technical merits, that the tax position will be realized or sustained upon examination. The term more likely than not means a likelihood of more than 50 percent; the terms examined and upon examination also include resolution of the related appeals or litigation processes, if any. A tax position that meets the more-likely-than-not recognition threshold is initially and subsequently measured as the largest amount of tax benefit that has a greater than 50 percent likelihood of being realized upon settlement with a taxing authority that has full knowledge of all relevant information. The determination of whether or not a tax position has met the more-likely-than-not recognition threshold considers the facts, circumstances, and information available at the reporting date and is subject to management's judgment. Deferred tax assets may be reduced by deferred tax liabilities and a valuation allowance if, based on the weight of evidence available, it is more likely than not that some portion or all of a deferred tax asset will not be realized. On December 22, 2017, the Tax Cuts and Jobs Act (TCJA) was signed into law by the President of the United States. TCJA is a tax reform act that among other things, reduced corporate tax rates to 21 percent effective January 1, 2018. FASB ASC 740, Income Taxes , requires deferred tax assets and liabilities to be adjusted for the effect of a change in tax laws or rates in the year of enactment, which is the year in which the change was signed into law. Accordingly, the Company adjusted its deferred tax assets and liabilities at December 31, 2017, using the new corporate tax rate of 21 percent. See Note 8. Stock Compensation Plans: At December 31, 2017 , the Company had options outstanding under stock-based compensation plans, which are described in more detail in Note 10. The plans have been accounted for under the accounting guidance (FASB ASC 718, Compensation - Stock Compensation) which requires that the compensation cost relating to share-based payment transactions be recognized in financial statements. That cost will be measured based on the grant date fair value of the equity or liability instruments issued. The stock compensation accounting guidance covers a wide range of share-based compensation arrangements including stock options, restricted share plans, performance-based awards, share appreciation rights, and stock or other stock based awards. The stock compensation accounting guidance requires that compensation cost for all stock awards be calculated and recognized over the employees' service period, generally defined as the vesting period. For awards with graded-vesting, compensation cost is recognized on a straight-line basis over the requisite service period for the entire award. A Black-Scholes model is used to estimate the fair value of stock options, while the market value of the Company's common stock at the date of grant is used for restrictive stock awards and stock grants. Employee Benefit Plan: Employee benefit plan costs are based on the percentage of individual employee's salary, not to exceed the amount that can be deducted for federal income tax purposes. Variable interest entities: An entity is referred to as a variable interest entity (VIE) if it meets the criteria outlined in ASC Topic 810, which are: (1) the entity has equity that is insufficient to permit the entity to finance its activities without additional subordinated financial support from other parties or (2) the entity has equity investors that cannot make significant decisions about the entity's operations or that do not absorb the expected losses or receive the expected returns of the entity. A VIE must be consolidated by the Company if it is deemed to be the primary beneficiary of the VIE, which is the party involved with the VIE that has a majority of the expected losses, expected residual returns, or both. At December 31, 2017 , the Company had an investment in Community Advantage Fund, LLC that qualified as an unconsolidated VIE. The Company’s investment in a partnership consists of an equity interest in a lending partnership for the purposes of loaning funds to an unrelated entity. This entity will use the funds to make loans through the SBA Community Advantage loan Initiative. The Company uses the equity method when it owns an interest in a partnership and can exert significant influence over the partnership’s operations. Under the equity method, the Company’s ownership interest in the partnership’s capital is reported as an investment on its consolidated balance sheets in other assets and the Company’s allocable share of the income or loss from the partnership is reported in noninterest income or expense in the consolidated statements of income. The Company ceases recording losses on an investment in partnership when the cumulative losses and distributions from the partnership exceed the carrying amount of the investment and any advances made by the Company. After the Company’s investment in such partnership reaches zero, cash distributions received from these investments are recorded as income. Comprehensive Income: Accounting principles generally require that recognized revenue, expenses, gains and losses be included in net income. Although certain changes in assets and liabilities, such as unrealized gains and losses on available for sale securities, are reported as a separate component of the equity section of the balance sheet, such items, along with net income, are components of comprehensive income. Fair Value of Financial Instruments: Fair values of financial instruments are estimates using relevant market information and other assumptions, as more fully disclosed in Note 15. Fair value estimates involve uncertainties and matters of significant judgment. Changes in assumptions or in market conditions could significantly affect the estimates. Business Combinations: Business combinations are accounted for using the acquisition method of accounting. Under the acquisition method of accounting, acquired assets and assumed liabilities are included with the acquirer's accounts as of the date of acquisition at estimated fair value, with any excess of purchase price over the fair value of the net assets acquired (including identifiable intangible assets) capitalized as goodwill. In the event that the fair value of the net assets acquired exceeds the purchase price, an acquisition gain is recorded for the difference in consolidated statements of income for the period in which the acquisition occurred. An intangible asset is recognized as an asset apart from goodwill when it arises from contractual or other legal rights or if it is capable of being separated or divided from the acquired entity and sold, transferred, licensed, rented or exchanged. In addition, acquisition-related costs and restructuring costs are recognized as period expenses as incurred. Estimates of fair value are subject to refinement for a period not to exceed one year from acquisition date as information relative to acquisition date fair values becomes available. Earnings per common share: Basic earnings per common share represents income available to common stockholders divided by the weighted-average number of common shares outstanding during the period. Diluted earnings per common share reflects additional common shares that would have been outstanding if dilutive potential common shares had been issued, as well as any adjustment to income that would result from the assumed issuance. Potential common shares that may be issued by the Company relate to restricted stock and outstanding stock options and are determined using the treasury stock method Segment Reporting: ASC Topic 280, “Segment Reporting,” provides for the identification of reportable segments on the basis of distinct business units and their financial information to the extent such units are re

Business Combination

Business Combination	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Business Combination	On December 8, 2016, the Bank entered into a purchase and assumption agreement with Atlantic Capital Bank, N.A. that provided for the acquisition and assumption by the Bank of certain assets and liabilities associated with Atlantic Capital Bank’s branch office located at 3200 Keith Street NW, Cleveland, Tennessee 37312. The purchase was completed on May 19, 2017 for total cash consideration of $1,183,007 . The assets and liabilities as of the effective date of the transaction were recorded at their respective estimated fair values. The excess of the purchase price over the net estimated fair values of the acquired assets and liabilities was allocated to identifiable intangible assets with the remaining excess allocated to goodwill. In the periods following the acquisition, the financial statements will include the results attributable to the Cleveland branch purchase beginning on the date of purchase. For the twelve months period ended December 31, 2017, the revenues and net income attributable to the Cleveland branch were $903,311 and $63,385 , respectively. It is impracticable to determine the pro-forma impact to the 2017 revenues and net income if the acquisition had occurred on January 1, 2017 as the Company does not have access to those records for a single branch. The following table details the financial impact of the transaction, including the allocation of the purchase price to the fair values of net assets assumed and goodwill recognized: Allocation of Purchase Price (in thousands) Total consideration in cash $ 1,183 Fair value of assets acquired and liabilities assumed: Cash and cash equivalents 133 Loans 24,073 Premises and equipment 2,839 Core deposit intangible 310 Prepaid and other assets 77 Deposits (26,888 ) Payables and other liabilities (21 ) Total fair value of net assets acquired 523 Goodwill $ 660 As of December 31, 2017 there have not been any changes to the initial fair values recorded as part of the business combination. On May 22, 2017, the shareholders of the SmartFinancial, Inc (“ SmartFinancial ”) approved a merger with Capstone Bancshares, Inc. ("Capstone"), the one bank holding company of Capstone Bank, which became effective November 1, 2017. Capstone shareholders received either: (a) 0.85 shares of SmartFinancial common stock, (b) $18.50 in cash, or (c) a combination of 80% SmartFinancial common stock and 20% cash. Elections were limited by the requirement that 80% of the total shares of Capstone common stock be exchanged for SmartFinancial common stock and 20% be exchanged for cash. Therefore, the allocation of SmartFinancial common stock and cash that a Capstone shareholder received depended on the elections of other Capstone shareholders, and were allocated in accordance with the procedures set forth in the merger agreement. Capstone shareholders also received cash instead of any fractional shares they would have otherwise received in the merger. After the merger, shareholders of SmartFinancial owned approximately 74% of the outstanding common stock of the combined entity on a fully diluted basis, after taking into account the exchange ratio. The merger is being accounted for using the acquisition method of accounting, in accordance with the provisions of FASB ASC 805-10 Business Combinations. Under this guidance, for accounting purposes, SmartFinancial is considered the acquirer in the merger, and as a result the historical financial statements of the combined entity will be the historical financial statements of SmartFinancial. The merger was effected by the issuance of shares of SmartFinancial stock along with cash consideration to shareholders of Capstone. The assets and liabilities of Capstone as of the effective date of the merger were recorded at their respective estimated fair values and combined with those of SmartFinancial. The excess of the purchase price over the net estimated fair values of the acquired assets and liabilities was allocated to identifiable intangible assets with the remaining excess allocated to goodwill. Goodwill from the transaction was $38.0 million , none of which is deductible for income tax purposes. In periods following the merger, the financial statements of the combined entity will include the results attributable to Capstone beginning on the date the merger was completed. In the period ended December 31, 2017, the revenues and net income attributable to Capstone were $5.0 million and $0.2 million , respectively. The pro-forma impact to 2017 revenues and net income if the merger had occurred on December 31, 2016 would have been $24.9 million and $947 thousand , respectively. The fair value estimates of Capstone’s assets and liabilities recorded are preliminary and subject to refinement as additional information becomes available. Under current accounting principles, the Company’s estimates of fair values may be adjusted for a period of up to one year from the acquisition date. The following table details the financial impact of the merger, including the calculation of the purchase price, the allocation of the purchase price to the fair values of net assets assumed, and goodwill recognized: Calculation of Purchase Price Shares of SMBK common stock issued to Capstone shareholders as of November 1, 2017 2,908,094 Market price of SMBK common stock on November 1, 2017 $ 23.49 Estimated fair value of SMBK common stock issued (in thousands) 68,311 Estimated fair value of Capstone stock options (in thousands) 1,585 Cash consideration paid 15,826 Total consideration (in thousands) $ 85,722 Allocation of Purchase Price (in thousands) Total consideration above $ 85,722 Fair value of assets acquired and liabilities assumed: Cash and cash equivalents 16,810 Investment securities available for sale 51,638 Restricted investments 1,049 Loans 413,023 Premises and equipment 8,668 Bank owned life insurance 10,031 Core deposit intangible 5,530 Other real estate owned 410 Prepaid and other assets 6,360 Deposits (454,154 ) FHLB advances and other borrowings (4,887 ) Payables and other liabilities (6,803 ) Total fair value of net assets acquired 47,675 Goodwill $ 38,047

Securities

Securities	12 Months Ended
	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Securities	rtized cost and fair value of securities available-for-sale at December 31, 2017 and 2016 are summarized as follow (in thousands): December 31, 2017 Amortized Gross Gross Fair U.S. Government-sponsored enterprises (GSEs) $ 26,207 $ 1 $ (432 ) $ 25,776 Municipal securities 9,122 28 (147 ) 9,003 Other debt securities 974 — (24 ) 950 Mortgage-backed securities 117,263 136 (1,184 ) 116,215 Total $ 153,566 $ 165 $ (1,787 ) $ 151,944 December 31, 2016 Amortized Gross Gross Fair U.S. Government-sponsored enterprises (GSEs) $ 18,279 $ 8 $ (564 ) $ 17,723 Municipal securities 8,182 16 (179 ) 8,019 Mortgage-backed securities 104,585 185 (1,090 ) 103,680 Total $ 131,046 $ 209 $ (1,833 ) $ 129,422 The amortized cost and estimated market value of securities at December 31, 2017 , by contractual maturity, are shown below (in thousands). Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Amortized Fair Due in one year or less $ 2,174 $ 2,175 Due from one year to five years 21,606 21,292 Due from five years to ten years 8,037 7,822 Due after ten years 4,486 4,440 36,303 35,729 Mortgage-backed securities 117,263 116,215 Total $ 153,566 $ 151,944 The following tables present the gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities available-for-sale have been in a continuous unrealized loss position, as of December 31, 2017 and 2016 (in thousands): As of December 31, 2017 Less than 12 Months 12 Months or Greater Total Fair Gross Fair Gross Fair Gross U.S. Government- sponsored enterprises (GSEs) $ 1,358 $ (1 ) $ 13,420 $ (431 ) $ 14,778 $ (432 ) Municipal securities 3,418 (43 ) 2,112 (104 ) 5,530 (147 ) Other debt securities 950 (24 ) — — 950 (24 ) Mortgage-backed securities 61,332 (407 ) 35,048 (777 ) 96,380 (1,184 ) Total $ 67,058 $ (475 ) $ 50,580 $ (1,312 ) $ 117,638 $ (1,787 ) As of December 31, 2016 Less than 12 Months 12 Months or Greater Total Fair Gross Fair Gross Fair Gross U.S. Government- sponsored enterprises (GSEs) $ 14,702 $ (564 ) $ — $ — $ 14,702 $ (564 ) Municipal securities 6,368 (179 ) — — 6,368 (179 ) Mortgage-backed securities 67,063 (690 ) 8,948 (400 ) 76,011 (1,090 ) Total $ 88,133 $ (1,433 ) $ 8,948 $ (400 ) $ 97,081 $ (1,833 ) At December 31, 2017 , the categories of temporarily impaired securities, and management’s evaluation of those securities, are as follows: U.S. Government-sponsored enterprises: At December 31, 2017 , six investments in U.S. GSE securities had unrealized losses. These unrealized losses related principally to changes in market interest rates. The contractual terms of the investments does not permit the issuer to settle the securities at a price less than the amortized cost bases of the investments. Because the Bank does not intend to sell the investments and it is more likely than not that the Bank will not be required to sell the investments before recovery of their amortized cost bases, which may be maturity, the Bank does not consider these investments to be other-than temporarily impaired at December 31, 2017 . Municipal securities: At December 31, 2017 , thirteen investments in obligations of municipal securities had unrealized losses. The Bank believes the unrealized losses on those investments were caused by the interest rate environment and do not relate to the underlying credit quality of the issuers. Because the Bank does not intend to sell the investments and it is not more likely than not that the Bank will be required to sell the investments before recovery of their amortized cost bases, which may be maturity, the Bank does not consider these investments to be other than temporarily impaired at December 31, 2017 . Other debt securities: At December 31, 2017 , one investment in other debt securities had unrealized losses. The Bank believes the unrealized losses on this investment was caused by the interest rate environment and does not relate to the underlying credit quality of the issuers. Because the Bank does not intend to sell the investment and it is not more likely than not that the Bank will be required to sell the investment before recovery of their amortized cost bases, which may be maturity, the Bank does not consider this investment to be other than temporarily impaired at December 31, 2017 . Mortgage-backed securities: At December 31, 2017 , sixty investments in residential mortgage-backed securities had unrealized losses. This impairment is believed to be caused by the current interest rate environment. The contractual cash flows of those investments are guaranteed by an agency of the U.S. Government. Because the decline in market value is attributable to the current interest rate environment and not credit quality, and because the Bank does not intend to sell the investments and it is not more likely than not that the Bank will be required to sell the investments before recovery of their amortized cost bases, which may be maturity, the Bank does not consider these investments to be other than temporarily impaired at December 31, 2017 . Sales of available for sale securities for the years ended December 31, 2017 and 2016 , were as follows (in thousands): 2017 2016 Proceeds $ 12,614 $ 31,599 Gains realized 145 200 Losses realized 2 — Securities with a carrying value of $97,160,059 and $86,351,097 at December 31, 2017 and 2016 , respectively, were pledged to secure various deposits, securities sold under agreements to repurchase, as collateral for federal funds purchased from other financial institutions and serve as collateral for borrowings at the Federal Home Loan Bank.

Loans and Allowance for Loan Lo

Loans and Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Loans and Allowance for Loan Losses	io Segmentation: At December 31, 2017 and 2016 , loans consisted of the following (in thousands): December 31, 2017 December 31, 2016 PCI All Other Total PCI All Other Total Commercial real estate $ 17,903 $ 625,085 $ 642,988 $ 14,943 $ 400,265 $ 415,208 Consumer real estate 7,450 286,007 293,457 9,004 178,798 187,802 Construction and land development 5,120 130,289 135,409 1,678 116,191 117,869 Commercial and industrial 858 237,229 238,087 1,568 83,454 85,022 Consumer and other 1,463 11,854 13,317 — 7,475 7,475 Total loans 32,794 1,290,464 1,323,258 27,193 786,183 813,376 Less: Allowance for loan losses (16 ) (5,844 ) (5,860 ) — (5,105 ) (5,105 ) Loans, net $ 32,778 $ 1,284,620 $ 1,317,398 $ 27,193 $ 781,078 $ 808,271 For purposes of the disclosures required pursuant to the adoption of ASC 310, the loan portfolio was disaggregated into segments. A portfolio segment is defined as the level at which an entity develops and documents a systematic method for determining its allowance for credit losses. There are five loan portfolio segments that include commercial real estate, consumer real estate, construction and land development, commercial and industrial, and consumer and other. The following describe risk characteristics relevant to each of the portfolio segments: Commercial Real Estate: Commercial real estate loans include owner-occupied commercial real estate loans and loans secured by income-producing properties. Owner-occupied commercial real estate loans to operating businesses are long-term financing of land and buildings. These loans are repaid by cash flow generated from the business operation. Real estate loans for income-producing properties such as apartment buildings, office and industrial buildings, and retail shopping centers are repaid from rent income derived from the properties. Loans within this portfolio segment are particularly sensitive to the valuation of real estate. Consumer Real Estate: Consumer real estate loans include real estate loans secured by first liens, second liens, or open end real estate loans, such as home equity lines. These are repaid by various means such as a borrower's income, sale of the property, or rental income derived from the property. One to four family first mortgage loans are repaid by various means such as a borrower's income, sale of the property, or rental income derived from the property. Loans within this portfolio segment are particularly sensitive to the valuation of real estate. Construction and Land Development: Loans for real estate construction and development are repaid through cash flow related to the operations, sale or refinance of the underlying property. This portfolio segment includes extensions of credit to real estate developers or investors where repayment is dependent on the sale of the real estate or income generated from the real estate collateral. Loans within this portfolio segment are particularly sensitive to the valuation of real estate. Commercial and Industrial: The commercial and industrial loan portfolio segment includes commercial, financial, and agricultural loans. These loans include those loans to commercial customers for use in normal business operations to finance working capital needs, equipment purchases, or expansion projects. Loans are repaid by business cash flows. Collection risk in this portfolio is driven by the creditworthiness of the underlying borrower, particularly cash flows from the customers' business operations. Consumer and Other: The consumer loan portfolio segment includes direct consumer installment loans, overdrafts and other revolving credit loans, and educational loans. Loans in this portfolio are sensitive to unemployment and other key consumer economic measures. Credit Risk Management: The Company employs a credit risk management process with defined policies, accountability and routine reporting to manage credit risk in the loan portfolio segments. Credit risk management is guided by credit policies that provide for a consistent and prudent approach to underwriting and approvals of credits. Within the Credit Policy, procedures exist that elevate the approval requirements as credits become larger and more complex. All loans are individually underwritten, risk-rated, approved, and monitored. Responsibility and accountability for adherence to underwriting policies and accurate risk ratings lies in each portfolio segment. For the consumer real estate and consumer and other portfolio segments, the risk management process focuses on managing customers who become delinquent in their payments. For the other portfolio segments, the risk management process focuses on underwriting new business and, on an ongoing basis, monitoring the credit of the portfolios, including a third party review of the largest credits on an annual basis or more frequently as needed. To ensure problem credits are identified on a timely basis, several specific portfolio reviews occur periodically to assess the larger adversely rated credits for proper risk rating and accrual status. Credit quality and trends in the loan portfolio segments are measured and monitored regularly. Detailed reports, by product, collateral, accrual status, etc., are reviewed by the Senior Credit Officer and the Directors Loan Committee. The allowance for loan losses is a valuation reserve allowance established through provisions for loan losses charged against income. The allowance for loan losses, which is evaluated quarterly, is maintained at a level that management deems sufficient to absorb probable losses inherent in the loan portfolio. Loans deemed to be uncollectible are charged against the allowance for loan losses, while recoveries of previously charged-off amounts are credited to the allowance for loan losses. The allowance for loan losses is comprised of specific valuation allowances for loans evaluated individually for impairment and general allocations for pools of homogeneous loans with similar risk characteristics and trends. The allowance for loan losses related to specific loans is based on management's estimate of potential losses on impaired loans as determined by (1) the present value of expected future cash flows; (2) the fair value of collateral if the loan is determined to be collateral dependent or (3) the loan's observable market price. The Company's homogeneous loan pools include commercial real estate loans, consumer real estate loans, construction and land development loans, commercial and industrial loans, and consumer and other loans. The general allocations to these loan pools are based on the historical loss rates for specific loan types and the internal risk grade, if applicable, adjusted for both internal and external qualitative risk factors. The qualitative factors considered by management include, among other factors, (1) changes in local and national economic conditions; (2) changes in asset quality; (3) changes in loan portfolio volume; (4) the composition and concentrations of credit; (5) the impact of competition on loan structuring and pricing; (6) the impact of interest rate changes on portfolio risk and (7) effectiveness of the Company's loan policies, procedures and internal controls. The total allowance established for each homogeneous loan pool represents the product of the historical loss ratio adjusted for qualitative factors and the total dollar amount of the loans in the pool. Credit Risk Management (continued): The composition of loans by loan classification for impaired and performing loan status at December 31, 2017 and 2016 , is summarized in the tables below (amounts in thousands): December 31, 2017 Commercial Consumer Construction Commercial Consumer Total Performing loans $ 624,638 $ 284,585 $ 129,742 $ 237,016 $ 11,842 $ 1,287,823 Impaired loans 447 1,422 547 213 12 2,641 625,085 286,007 130,289 237,229 11,854 1,290,464 PCI loans 17,903 7,450 5,120 858 1,463 32,794 Total $ 642,988 $ 293,457 $ 135,409 $ 238,087 $ 13,317 $ 1,323,258 December 31, 2016 Commercial Consumer Construction Commercial Consumer Total Performing loans $ 400,146 $ 177,977 $ 115,326 $ 83,244 $ 7,475 $ 784,168 Impaired loans 119 821 865 210 — 2,015 400,265 178,798 116,191 83,454 7,475 786,183 PCI loans 14,943 9,004 1,678 1,568 — 27,193 Total loans $ 415,208 $ 187,802 $ 117,869 $ 85,022 $ 7,475 $ 813,376 The following tables show the allowance for loan losses allocation by loan classification for impaired and performing loans as of December 31, 2017 and 2016 (amounts in thousands): December 31, 2017 Construction Commercial Consumer Commercial Consumer and Land and and Real Estate Real Estate Development Industrial Other Total Performing loans $ 2,444 $ 1,340 $ 521 $ 890 $ 204 $ 5,399 PCI loans 16 — — — — 16 Impaired loans 5 256 — 172 12 445 Total $ 2,465 $ 1,596 $ 521 $ 1,062 $ 216 $ 5,860 Credit Risk Management (continued): December 31, 2016 Construction Commercial Consumer Commercial Consumer and Land and and Real Estate Real Estate Development Industrial Other Total Performing loans $ 2,369 $ 1,382 $ 717 $ 516 $ 117 $ 5,101 PCI Loans — — — — — — Impaired loans — — — 4 — 4 Total $ 2,369 $ 1,382 $ 717 $ 520 $ 117 $ 5,105 The following tables detail the changes in the allowance for loan losses for the year ending December 31, 2017 and December 31, 2016 , by loan classification (amounts in thousands): December 31, 2017 Commercial Consumer Construction Commercial Consumer Total Beginning balance $ 2,369 $ 1,382 $ 717 $ 520 $ 117 $ 5,105 Loans charged off — (111 ) — (24 ) (141 ) (276 ) Recoveries of loans charged off 8 99 13 67 61 248 Provision (reallocation) charged to operating expense 88 226 (209 ) 499 179 783 Ending balance $ 2,465 $ 1,596 $ 521 $ 1,062 $ 216 $ 5,860 December 31, 2016 Commercial Consumer Construction Commercial Consumer Total Beginning balance $ 1,906 $ 1,015 $ 627 $ 777 $ 29 $ 4,354 Loans charged off — (102 ) (14 ) (35 ) (155 ) (306 ) Recoveries of loans charged off 45 76 22 58 68 269 Provision (reallocation) charged to operating expense 418 393 82 (280 ) 175 788 Ending balance $ 2,369 $ 1,382 $ 717 $ 520 $ 117 $ 5,105 Credit Risk Management (continued): A description of the general characteristics of the risk grades used by the Company is as follows: Pass: Loans in this risk category involve borrowers of acceptable-to-strong credit quality and risk who have the apparent ability to satisfy their loan obligations. Loans in this risk grade would possess sufficient mitigating factors, such as adequate collateral or strong guarantors possessing the capacity to repay the debt if required, for any weakness that may exist. Watch: Loans in this risk category involve borrowers that exhibit characteristics, or are operating under conditions that, if not successfully mitigated as planned, have a reasonable risk of resulting in a downgrade within the next six to twelve months. Loans may remain in this risk category for six months and then are either upgraded or downgraded upon subsequent evaluation. Special Mention: Loans in this risk grade are the equivalent of the regulatory definition of "Other Assets Especially Mentioned" classification. Loans in this category possess some credit deficiency or potential weakness, which requires a high level of management attention. Potential weaknesses include declining trends in operating earnings and cash flows and /or reliance on the secondary source of repayment. If left uncorrected, these potential weaknesses may result in noticeable deterioration of the repayment prospects for the asset or in the Company's credit position. Substandard: Loans in this risk grade are inadequately protected by the borrower's current financial condition and payment capability or of the collateral pledged, if any. Loans so classified have a well-defined weakness or weaknesses that jeopardize the orderly repayment of debt. They are characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. Doubtful: Loans in this risk grade have all the weaknesses inherent in those classified as substandard, with the added characteristic that the weaknesses make collection or orderly repayment in full, on the basis of current existing facts, conditions and values, highly questionable and improbable. Possibility of loss is extremely high, but because of certain important and reasonably specific factors that may work to the advantage and strengthening of the exposure, its classification as an estimated loss is deferred until its more exact status may be determined. Uncollectible: Loans in this risk grade are considered to be non-collectible and of such little value that their continuance as bankable assets is not warranted. This does not mean the loan has absolutely no recovery value, but rather it is neither practical nor desirable to defer writing off the loan, even though partial recovery may be obtained in the future. Charge-offs against the allowance for loan losses are taken in the period in which the loan becomes uncollectible. Consequently, the Company typically does not maintain a recorded investment in loans within this category. The following tables outline the amount of each loan classification and the amount categorized into each risk rating as of December 31, 2017 and 2016 (amounts in thousands): Non PCI Loans December 31, 2017 Commercial Consumer Construction Commercial Consumer Total Pass $ 616,028 $ 279,464 $ 129,359 $ 233,942 $ 11,624 $ 1,270,417 Watch 7,673 2,543 383 3,007 62 13,668 Special mention 1,006 2,627 — 64 155 3,852 Substandard 378 1,159 547 157 — 2,241 Doubtful — 214 — 59 13 286 Total $ 625,085 $ 286,007 $ 130,289 $ 237,229 $ 11,854 $ 1,290,464 Credit Risk Management (continued): PCI Loans December 31, 2017 Commercial Consumer Construction Commercial Consumer Total Pass $ 14,386 $ 4,151 $ 4,134 $ 68 $ 819 $ 23,558 Watch 261 1,345 649 120 262 2,637 Special mention — 456 — 58 24 538 Substandard 3,084 1,192 337 588 107 5,308 Doubtful 172 306 — 24 251 753 Total $ 17,903 $ 7,450 $ 5,120 $ 858 $ 1,463 $ 32,794 Total loans $ 642,988 $ 293,457 $ 135,409 $ 238,087 $ 13,317 $ 1,323,258 Non PCI Loans December 31, 2016 Commercial Consumer Construction Commercial Consumer Total Pass $ 399,505 $ 177,466 $ 115,237 $ 82,992 $ 7,238 $ 782,438 Watch 640 550 89 252 — 1,531 Special mention — 104 — — 237 341 Substandard 120 678 865 210 — 1,873 Doubtful — — — — — — Total $ 400,265 $ 178,798 $ 116,191 $ 83,454 $ 7,475 $ 786,183 PCI Loans December 31, 2016 Commercial Consumer Construction Commercial Consumer Total Pass $ 11,836 $ 6,811 $ 1,019 $ 1,507 $ — $ 21,173 Watch 1,045 1,577 645 22 — 3,289 Special mention — — — 12 — 12 Substandard 2,062 616 14 — — 2,692 Doubtful — — — 27 — 27 Total $ 14,943 $ 9,004 $ 1,678 $ 1,568 $ — $ 27,193 Total loans $ 415,208 $ 187,802 $ 117,869 $ 85,022 $ 7,475 $ 813,376 Past Due Loans: A loan is considered past due if any required principal and interest payments have not been received as of the date such payments were required to be made under the terms of the loan agreement. Generally, management places a loan on nonaccrual when there is a clear indication that the borrower’s cash flow may not be sufficient to meet payments as they become due, which is generally when a loan is 90 days past due. The following tables present the aging of the recorded investment in loans and leases as of December 31, 2017 and 2016 (amounts in thousands): December 31, 2017 30-89 Days Past Due 90 Nonaccrual Total PCI Loans Current Total Commercial real estate $ 517 $ 728 $ 128 $ 1,373 $ 17,903 $ 623,712 $ 642,988 Consumer real estate 963 33 991 1,987 7,450 284,020 293,457 Construction and land development 65 326 547 938 5,120 129,351 135,409 Commercial and industrial 286 131 85 502 858 236,727 238,087 Consumer and other 165 291 13 469 1,463 11,385 13,317 Total $ 1,996 $ 1,509 $ 1,764 $ 5,269 $ 32,794 $ 1,285,195 $ 1,323,258 December 31, 2016 30-89 Days Past Due 90 Nonaccrual Total PCI Current Total Commercial real estate $ 395 $ — $ — $ 395 $ 14,943 $ 399,870 $ 415,208 Consumer real estate 695 699 386 1,780 9,004 177,018 187,802 Construction and land development 690 — 865 1,555 1,678 114,636 117,869 Commercial and industrial 257 — 164 421 1,568 83,033 85,022 Consumer and other 17 — — 17 — 7,458 7,475 Total $ 2,054 $ 699 $ 1,415 $ 4,168 $ 27,193 $ 782,015 $ 813,376 Impaired Loans: A loan held for investment is considered impaired when, based on current information and events, it is probable that the Company will be unable to collect all amounts due (both principal and interest) according to the terms of the loan agreement. The following is an analysis of the impaired loan portfolio detailing the related allowance recorded as of and for the years ended December 31, 2017 and 2016 (amounts in thousands): For the year ended At December 31, 2017 December 31, 2017 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized Impaired loans without a valuation allowance: Non PCI Loans: Commercial real estate $ 424 $ 454 $ — $ 204 $ 44 Consumer real estate 415 420 — 401 16 Construction and land development 547 547 — 628 — Commercial and industrial 41 41 — 44 3 Consumer and other — — — — — 1,427 1,462 — 1,277 63 PCI loans: None in 2017 Impaired loans with a valuation allowance: Non PCI Loans: Commercial real estate 23 23 5 5 1 Consumer real estate 1,007 1,033 256 601 38 Construction and land development — — — — — Commercial and industrial 172 172 172 117 10 Consumer and other 12 13 12 2 1 1,214 1,241 445 725 50 PCI loans: Commercial real estate 16 123 16 3 16 Total impaired loans $ 2,657 $ 2,826 $ 461 $ 2,005 $ 129 Impaired Loans (continued): For the year ended At December 31, 2016 December 31, 2016 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized Impaired loans without a valuation allowance: Non PCI Loans: Commercial real estate $ 119 $ 119 $ — $ 1,311 $ 73 Consumer real estate 821 849 — 2,334 100 Construction and land development 865 865 — 967 3 Commercial and industrial 46 46 — 47 4 Consumer and other — — — — — 1,851 1,879 — 4,659 180 PCI loans: None in 2016 Impaired loans with a valuation allowance: Non PCI Loans: Commercial real estate — — — — — Consumer real estate — — — — — Construction and land development — — — — — Commercial and industrial 164 243 4 306 70 Consumer and other — — — — — 164 243 4 306 70 PCI loans: None in 2016 Total impaired loans $ 2,015 $ 2,122 $ 4 $ 4,965 $ 250 Troubled Debt Restructurings: At December 31, 2017 and 2016 , impaired loans included loans that were classified as Troubled Debt Restructurings ("TDRs"). The restructuring of a loan is considered a TDR if both (i) the borrower is experiencing financial difficulties and (ii) the creditor has granted a concession. In assessing whether or not a borrower is experiencing financial difficulties, the Company considers information currently available regarding the financial condition of the borrower. This information includes, but is not limited to, whether (i) the debtor is currently in payment default on any of its debt; (ii) a payment default is probable in the foreseeable future without the modification; (iii) the debtor has declared or is in the process of declaring bankruptcy; and (iv) the debtor's projected cash flow is sufficient to satisfy contractual payments due under the original terms of the loan without a modification. The Company considers all aspects of the modification to loan terms to determine whether or not a concession has been granted to the borrower. Key factors considered by the Company include the debtor's ability to access funds at a market rate for debt with similar risk characteristics, the significance of the modification relative to unpaid principal balance or collateral value of the debt, and the significance of a delay in the timing of payments relative to the original contractual terms of the loan. Troubled Debt Restructurings (continued): The most common concessions granted by the Company generally include one or more modifications to the terms of the debt, such as (i) a reduction in the interest rate for the remaining life of the debt; (ii) an extension of the maturity date at an interest rate lower than the current market rate for new debt with similar risk; (iii) a temporary period of interest-only payments; and (iv) a reduction in the contractual payment amount for either a short period or remaining term of the loan. As of December 31, 2017 and 2016 , management had approximately $41,000 and $608,000 , respectively, in loans that met the criteria for restructured. No restructured loans were on nonaccrual as of December 31, 2017. There were $442,000 restructured loans on nonaccrual at December 31, 2016. A loan is placed back on accrual status when both principal and interest are current and it is probable that management will be able to collect all amounts due (both principal and interest) according to the terms of the loan agreement. There were no loans modified as troubled debt restructurings during the year ended December 31, 2017. The following table presents a summary of loans that were modified as troubled debt restructurings during the year ended December 31, 2016 (amounts in thousands): December 31, 2016 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Construction and land development 1 $ 278 $ 278 Commercial and industrial 1 164 164 There were no loans that were modified as troubled debt restructurings during the past twelve months and for which there was a subsequent payment default. Purchased Credit Impaired Loans: The Company has acquired loans which there was, at acquisition, evidence of deterioration of credit quality since origination and it was probable, at acquisition, that all contractually required payments would not be collected. The carrying amount of those loans at for the years ended December 31, 2017 and 2016 is as follows (in thousands): 2017 2016 Commercial real estate $ 23,366 $ 18,473 Consumer real estate 10,764 12,111 Construction and land development 6,285 2,553 Commercial and industrial 1,452 2,482 Consumer and other 1,710 — Total loans $ 43,577 $ 35,619 Less remaining purchase discount (10,783 ) (8,426 ) Total, gross 32,794 27,193 Less: Allowance for loan losses (16 ) — Carrying amount, net of allowance $ 32,778 $ 27,193 The following is a summary of the accretable discount on acquired loans for the years ended December 31, 2017 and 2016 (in thousands): 2017 2016 Accretable yield, beginning of period $ 8,950 $ 10,217 Additions 2,581 — Accretion income (4,217 ) (2,588 ) Reclassification from nonaccretable 926 1,585 Other changes, net 1,047 (264 ) Accretable yield, end of period $ 9,287 $ 8,950 The Company increased the allowance for loan losses on purchase credit impaired loans in the amount of approximately $16,000 during the year ended December 31, 2017 and no increases were made during the year ended December 31, 2016 . Purchased credit impaired loans acquired from Capstone during the year ended December 31, 2017 for which it was probable at acquisition that all contractually required payments would not be collected are as follows (in thousands): 2017 Contractual principal and interest at acquisition $ 25,288 Nonaccretable difference 5,725 Expected cash flows at acquisition 19,563 Accretable yield 2,581 Basis in PCI loans at acquisition-estimated fair value $ 16,982 Related Party Loans: In the ordinary course of business, the Company has granted loans to certain related parties, including directors, executive officers, and their affiliates. The interest rates on these loans were substantially the same as rates prevailing at the time of the transaction and repayment terms are customary for the type of loan. A summary of activity in loans to related parties is as follows (in thousands): 2017 2016 Balance, beginning of year $ 12,999 $ 10,851 Disbursements 14,533 855 Removal of credit lines — (1,153 ) Changes in ownership — 4,830 Repayments (9,202 ) (2,384 ) Balance, end of year $ 18,330 $ 12,999 At December 31, 2017 , the Company had pre-approved but unused lines of credit totaling approximately $5,833,000 to related parties.

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Premises and Equipment	Premises and Equipment A summary of premises and equipment at December 31, 2017 and 2016 , is as follows (in thousands): 2017 2016 Land and land improvements $ 10,854 $ 8,354 Building and leasehold improvements 28,576 18,507 Furniture, fixtures and equipment 10,073 7,043 Construction in progress 1,495 2,789 Total, gross 50,998 36,693 Accumulated depreciation (7,998 ) (6,157 ) Total, net $ 43,000 $ 30,536 At December 31, 2017 management estimates the cost necessary to complete the construction in progress will be approximately $3.04 million . The Company leases several branch locations and also has three ground leases under non-cancelable operating lease agreements. The leases expire between January 2018 and November 2023. Lease expense under the leases was $721,534 and $728,004 in 2017 and 2016 , respectively. At December 31, 2017 , the remaining minimum lease payments relating to these leases were as follows (in thousands): 2018 $ 608 2019 500 2020 487 2021 344 2022 124 2023 40 Depreciation expense was $1,841,524 and $1,435,090 for the years ended December 31, 2017 and 2016 , respectively.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2017
Deposits [Abstract]
Deposits	Deposits The aggregate amount of time deposits in denominations of $250,000 or more was approximately $171,529,000 and $123,053,000 at December 31, 2017 and 2016 , respectively. At December 31, 2017 , the scheduled maturities of time deposits are as follows (in thousands): 2018 $ 290,093 2019 84,906 2020 36,170 2021 14,353 2022 16,039 Thereafter 120 Total $ 441,681 As of December 31, 2017 and 2016, there was a fair value adjustment of $1,092,456 and $303,981 , respectively, to time deposits as a result of business combinations. At December 31, 2017 and 2016 , the Company had $155,000 and $76,380 , respectively, of deposit accounts in overdraft status that have been reclassified to loans on the accompanying consolidated balance sheets. From time to time, the Company engages in deposit transactions with its directors, executive officers and their related interests (collectively referred to as "related parties"). Such deposits are made in the ordinary course of business and on substantially the same terms as those for comparable transactions prevailing at the time and do not present other unfavorable features. The total amount of related party deposits was $16.7 million and $15.1 million at December 31, 2017 and 2016 , respectively.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill and intangible assets Past business combinations have created $42,873,689 in goodwill for the Company. Finite lived intangible assets of the Company represent a core deposit premium recorded upon the purchase of certain assets and liabilities from other financial institutions. The Company reviews the carrying value of this intangible on an annual basis and on an interim basis if certain events or circumstances indicate that an impairment loss may have been incurred. Management has determined that no impairment has occurred on this asset. The following table presents information about our core deposit premium intangible asset at December 31 (in thousands): 2017 2016 Gross Accumulated Gross Accumulated Amortized intangible asset: Core deposit intangible $ 8,589 $ 626 $ 2,750 $ 280 The following table presents information about aggregate amortization expense for 2017 and 2016 and for the succeeding fiscal years as follows (in thousands): 2017 2016 Aggregate amortization expense of core deposit premium intangible $ 346 $ 305 Estimated aggregate amortization expense of the core deposit premium intangible for the year ending December 31 (in thousands): 2018 $ 772 2019 772 2020 717 2021 670 2022 670 Thereafter 4,362 Total $ 7,963

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income tax expense in the consolidated statements of income for the years ended December 31, 2017 and 2016 , includes the following (in thousands): 2017 2016 Current tax expense Federal $ 1,962 $ 2,503 State 428 531 Deferred tax expense (benefit) related to: Provision for loan losses (355 ) (320 ) Depreciation 374 203 Fair value adjustments 1,611 356 Nonaccrual interest (26 ) (26 ) Foreclosed real estate 55 117 Core deposit intangible (123 ) (117 ) Other 63 115 Change in tax rate 2,440 — Total income tax expense $ 6,429 $ 3,362 The income tax expense is different from the expected tax expense computed by multiplying income before income tax expense by the statutory income tax rates. The reasons for this difference are as follows (in thousands): 2017 2016 Federal income tax expense computed at the statutory rate $ 3,891 $ 3,115 State income taxes, net of federal tax benefit 491 393 Nondeductible acquisition expenses 364 — Change in tax rate 2,440 — Other (757 ) (146 ) Total income tax expense $ 6,429 $ 3,362 The components of the net deferred tax asset as of December 31, 2017 and 2016 , were as follows (in thousands): 2017 2016 Deferred tax assets: Allowance for loan losses $ 1,561 $ 1,932 Fair value adjustments 4,829 3,744 Foreclosed real estate 301 539 Deferred compensation 849 415 State net operating loss carryforward — — Other 849 561 Total deferred tax assets 8,389 7,191 Deferred tax liabilities: Accumulated depreciation 1,194 1,903 Core deposit intangible 1,945 946 Other 223 639 Total deferred tax liabilities 3,362 3,488 Net deferred tax asset $ 5,027 $ 3,703 The income tax returns of the Company for 2016 , 2015 , and 2014 are subject to examination by the federal and state taxing authorities, generally for three years after they were filed.

Federal Home Loan Bank Advances

Federal Home Loan Bank Advances and Other Borrowings	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Federal Home Loan Bank Advances and Other Borrowings	Line of Credit: On August 28, 2015, the Company entered into a loan agreement (the “ Loan Agreement ”) with CapStar Bank (the “ Lender ”) providing for a revolving line of credit of up to $8,000,000 . The line of credit was paid in full in March 2016 after which the line matured on February 28, 2017. On October 31, 2017, the Company entered into a loan agreement (the “ Loan Agreement No. 2 ”) with CapStar Bank (the “ Lender ”) providing for a revolving line of credit of up to $15,000,000 . The Company may borrow and reborrow under the revolving line of credit until the line of credit termination date of January 15, 2019, after which no advances under the revolving line of credit may be reborrowed. The term loan commencement date would begin on January 16, 2019. Line of Credit borrowings and the term loan will accrue interest at the Lender’s prime rate minus .25%, subject to a 3.50% floor. Beginning 90 days after the effective date of the revolving line of credit, the Company is required to pay quarterly payments of interest. In addition, commencing on January 15, 2019, the Company must pay quarterly principal amortization payments of $262,500 for each fiscal quarter in 2019, $287,500 for each fiscal quarter in 2020, $312,500 for each fiscal quarter in 2021 and $337,500 for each fiscal quarter in 2022 until and including the maturity date. The scheduled principal amortization payments are based upon the assumption that the revolving line of credit is fully drawn, and the required payments will be reduced on a pro-rata basis relative to the amount borrowed if the revolving line of credit is not fully drawn. The loan will mature on October 15, 2022, at which time all outstanding amounts under the loan agreement no. 2 will become due and payable. In connection with entering into the Loan Agreement No. 2, the Company issued to the Lender a line of credit note dated as of October 31, 2017. The Loan Agreement No. 2 contains typical representations, warranties and covenants for a revolving line of credit, and the loan agreement has certain financial covenants and capital ratio requirements. Pursuant to the Loan Agreement No. 2, the Bank may not permit non-performing assets to be greater than 3.25% of total assets. The Bank must not permit its Texas ratio (nonperforming assets divided by the sum of tangible equity plus the allowance for loan and lease losses) to be greater than 35.00%, and must not permit its liquidity ratio to be less than 9.00% (or less than 10.00% for two consecutive quarters). The Bank will not permit, at the end of each quarter, its returns on average assets to be less than .45% from December 31, 2017 through and including September 30, 2018 and .50% at December 31, 2018 and thereafter. The Bank will not permit the debt service coverage ratio, as of June 30 and December 31 of each fiscal year, commencing on December 31, 2017, to be less than 1.25:1.00 . The regulatory covenant states the Company will be "well capitalized," or such other successor term with a similar meaning, for all applicable state and federal regulatory purposes at all times, and will not be subject to any written agreement, order, capital directive or prompt corrective action directive by any Governmental Authority having regulatory authority over the Company, except where such order, capital directive or prompt corrective action directive does not result in, nor could reasonably be expected to result in, a Material Adverse Effect, or if required by any Governmental Authority having regulatory authority over the Borrower in order to remain "well capitalized" and in compliance with all applicable regulatory requirements, will have such higher amounts of Total Risk-based Capital and Tier 1 Risk-based Capital and/or such greater Tier 1 Leverage Ratio as specified by such Governmental Authority. Each Financial Institution Subsidiary of the Company will be "well capitalized , " or such other successor term with a similar meaning, for all applicable state and federal regulatory purposes at all times, and such Financial Institution Subsidiary (i) will have a Total Risk-based Capital Ratio of 10.50% or greater, a Tier 1 Risk based Capital Ratio of 9.50% or greater, and a Tier 1 Leverage Ratio of 8.00% or greater (each as defined by applicable federal and state regulations or orders) and not be subject to any written agreement, order, capital directive or prompt corrective action directive by any Governmental Authority having regulatory authority over such Financial Institution Subsidiary, except where such order, capital directive or prompt corrective action directive does not result in, nor could reasonably be expected to result in, a Material Adverse Effect, or (ii) if required by any Governmental Authority having regulatory authority over such Financial Institution Subsidiary in order to remain "well capitalized" and in compliance with all applicable regulatory requirements, will have such higher amounts of Total Risk-based Capital and Tier 1 Risk-based Capital and/or such greater Tier 1 Leverage Ratio as specified by such Governmental Authority. Notwithstanding the foregoing, if at any time any such Governmental Authority changes the definition of "well capitalized" either by amending such ratios or otherwise, such amended definition, and any such amended or new ratios, shall automatically, and in lieu of the existing definitions and ratios set forth in this Section, be incorporated by reference into this Agreement as the minimum standard for the Company or any Financial Institution Subsidiary, as the case may be, on and as of the date that any such amendment becomes effective by applicable statute, regulation, order or otherwise. Line of Credit(continued): The interest coverage ratio covenant states the Company will not permit, as of June 30 and December 31 of each fiscal year, commencing December 31, 2017, its interest coverage ratio to be less than 2.50:1.00. As of December 31, 2017 , the Company and the Bank were in compliance with all of the loan covenants except for the return on assets. The return on assets covenant was not met due to the tax law enacted in December 2017 which caused the Company to write down the deferred tax asset to the new tax rate. Capstar has waived the covenant for December 2017 since the non-compliance was due to the tax law change and not caused by operations of the Company or Bank. The Loan Agreement No. 2 has standard and commercially reasonable events of default, such as non-payment, failure to perform any covenant or agreement, breach of any representation or warranty, failure to pay other material indebtedness, bankruptcy, insolvency, any ERISA event, any material judgment, any material adverse effect, any change in control, any failure to be insured by the FDIC or any action by a governmental or regulatory authority, etc. The Lender has the right to accelerate the indebtedness upon an event of default. The obligations of the Company under the Loan Agreement No. 2 are secured by a pledge of all of the capital stock of the Bank pursuant to stock pledge and security agreements. In the event of a default by the Company under the loan Agreement, the lender may terminate the commitments made under the loan agreement, declare all amounts outstanding to be payable immediately, and exercise or pursue any other remedy permitted under the loan agreement or the pledge agreements, or conferred to the lender by operation of law. As of December 31, 2017, the outstanding borrowings under the line of credit were $10,000,000 and the rate was 4.25% . The primary source of liquidity for the Company is the payment of dividends from the Bank. As of December 31, 2016 and 2017, the Bank was under no dividend restrictions that requires regulatory approval prior to the payment of a dividend from the Bank to the Company. FHLB borrowings: The Bank has agreements with the Federal Home Loan Bank of Cincinnati (FHLB) that can provide advances to the Bank in an amount up to $36,224,294 . All of the loans are secured by first mortgages on 1-4 family residential, multi-family properties and commercial properties and are pledged as collateral for these advances. Additionally, the Bank pledged securities to FHLB with a carrying amount of $16,252,434 at December 31, 2017 and $14,844,441 at December 31, 2016. At December 31, 2017, there were no advances from the FHLB. At December 31, 2016, FHLB advances consisted of the following (amounts in thousands): Long-term advance dated January 10, 2007, requiring monthly interest payments, fixed at 4.25%, with a put option exercisable in January 2008 and then quarterly thereafter, principal due in January 2017 $ 5,000 As of December 31, 2017 and December 31, 2016, there was a fair value adjustment of $0 and $ 5,765 , respectively, to FHLB borrowings as a result of a business combination. During the fixed rate term, the advances may be prepaid subject to a prepayment penalty as defined in the agreements. On agreements with put options, the FHLB has the right, at its discretion, to terminate the entire advance prior to the stated maturity date. The termination option may only be exercised on the expiration date of the predetermined lockout period and on a quarterly basis thereafter. At December 31, 2017, scheduled maturities of the Federal Home Loan Bank advances, federal funds purchased of $33,600,000 , and other borrowings are as follows (amounts in thousands): 2018 $33,600 2022 $10,000

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2017
Defined Benefit Plan [Abstract]
Employee Benefit Plans	Plan: The Company provides a deferred salary reduction plan (“ Plan ”) under Section 401 (k) of the Internal Revenue Code covering substantially all employees. After one year of service the Company matches 100 percent of employee contributions up to 3 percent of compensation and 50 percent of employee contributions on the next 2 percent of compensation. The Company's contribution to the Plan was $427,975 in 2017 and $403,309 in 2016 . Stock Option Plans: The Company has one currently active equity incentive plan administered by the Board of Directors, and three plans or programs, pursuant to which the Company has outstanding prior grants. These plans are described below: Legacy Cornerstone Bancshares, Inc. 2002 Long Term Incentive Plan – The plan provided Cornerstone Bancshares, Inc. officers and employees incentive stock options or non-qualified stock options to purchase shares of common stock. The exercise price for incentive stock options was not less than 100 percent of the fair market value of the common stock on the date of the grant. The exercise price of the non-qualified stock options was equal to or more or less than the fair market value of the common stock on the date of the grant. This plan expired in 2012. Legacy Cornerstone Non-Qualified Plan Options — During 2013 and 2014, Cornerstone issued non-qualified options to employees and directors. The options were originally documented in 2013 as being issued out of the Cornerstone Bancshares, Inc. 2002 Long Term Incentive Plan but that plan expired in 2012. The non-qualified options are governed by the grant document issued to the holders which incorporate the terms of the plan by reference. Legacy SmartFinancial, Inc. 2010 Incentive Plan - This plan was assumed by the Company on August 31, 2015. This plan provides for incentive stock options, nonqualified stock options, stock appreciation rights, restricted stock, performance awards, dividend equivalents and stock or other stock-based awards. The maximum number of common shares that could be sold or optioned under the plan is 525,000 shares. Under the plan, the exercise price of each option could not be less than 100 percent of the fair market value of the common stock on the date of grant. 2015 Stock Incentive Plan – This plan provides for incentive stock options, nonqualified stock options, and restricted stock. The maximum number of shares of common stock that can be sold or optioned under the plan is 2,000,000 shares. The term of each option shall be no more than ten years from the date of grant. In the case of an incentive stock option granted to a participant who, at the time the option is granted, owns stock representing more than ten percent of the voting power of all classes of stock of the Company or any parent or subsidiary thereof, the term of the option shall be five years from the date of grant or such shorter term as may be provided in the award agreement. The per share exercise price for the shares to be issued upon exercise of an option shall be such price as is determined by the plan administrator, subject to the following: In the case of an incentive stock option: (1) granted to an employee who, at the time of grant of such option, owns stock representing more than ten percent of the voting power of all classes of stock of the company or any parent or subsidiary thereof, the exercise price shall be no less than one hundred and ten percent of the fair market value per share on the date of grant; or (2) granted to any other employee, the per share exercise price shall be no less than one hundred percent of the fair market value per share on the date of grant. In the case of a nonstatutory stock option, the per share exercise price shall be no less than one hundred percent of the fair market value per share on the date of grant, unless otherwise determined by the Administrator. The incentive stock options vest 30 percent on the second anniversary of the grant date, 30 percent on the third anniversary of the grant date and 40 percent on the fourth anniversary of the grant date. Director non-qualified stock options vest 50 percent on the first anniversary of the grant date and 50 percent on the second anniversary of the grant date. Legacy Capstone Stock Option Plan - This plan was assumed by the Company on November 3, 2017 and subsequently closed. The plan provided for incentive stock options and nonqualified stock options. Under the plan, the exercise price of each option could not be less than 100 percent of the fair market value of the common stock on the date of grant. Stock Option Plans (continued): A summary of the status of these stock option plans is presented in the following table: Number Weighted Average Exercisable Price Outstanding at December 31, 2016 717,524 $ 10.57 Granted — — Exercised (506,923 ) 9.64 Forfeited (24,496 ) 19.90 Capstone options assumed in business combination 130,469 11.76 Outstanding at December 31, 2017 316,574 $ 11.82 Number Weighted Average Exercisable Price Outstanding at December 31, 2015 817,414 $ 10.62 Granted — — Exercised (89,556 ) 8.98 Forfeited (10,334 ) 28.49 Outstanding at December 31, 2016 717,524 $ 10.57 Information pertaining to options outstanding at December 31, 2017 , is as follows: Options Outstanding Options Exercisable Weighted- Average Remaining Weighted- Average Weighted- Average Exercise Number Contractual Exercise Number Exercise Prices Outstanding Life Price Exercisable Price 6.60 37,500 4.2 years 6.60 37,500 6.60 6.80 16,875 3.2 years 6.80 16,875 6.80 9.48 26,875 5.2 years 9.48 26,875 9.48 9.60 35,625 6.2 years 9.60 35,625 9.60 11.67 2,000 3.1 years 11.67 2,000 11.67 11.76 130,469 1.9 years 11.76 130,469 11.76 14.40 12,805 1.2 years 14.40 12,805 14.40 15.05 41,259 7.8 years 15.05 17,804 15.05 31.96 13,166 0.2 years 31.96 13,166 31.96 Outstanding, end of year 316,574 3.7 years 11.82 293,119 11.56 The Company recognized stock option compensation expense of $97,966 and $132,635 for the periods ended December 31, 2017 and 2016 , respectively. Stock appreciation rights compensation expense of $21,829 was recognized for the period ended December 31, 2017. There was no stock appreciated rights compensation expense recognized for the period ended December 31, 2016. Direct stock grant expense issued to local advisory board members of $31,791 was included in salary and benefit expense for the period ended December 31, 2017. There was no direct stock grant expense for the period ended December 31, 2016. The total fair value of shares underlying the options which vested during the periods ended December 31, 2017 and 2016 , was $313,977 and $95,658 , respectively. The income tax benefit recognized for the exercise of options for the periods ended December 31, 2017 and 2016 was $1,331,689 and $252,931 respectively. Stock Option Plans (continued): The intrinsic value of options exercised during the periods ended December 31, 2017 and 2016 was $5,468,780 and $660,476 , respectively. The aggregate intrinsic value of total options outstanding and exercisable options at December 31, 2017 was $3,261,940 and $ 3,105,964 , respectively. Cash received from options exercised under all share-based payment arrangements for the period ended December 31, 2017 was $4,885,646 . Information related to non-vested options for the period ended December 31, 2017 , is as follows: Number Weighted Average Grant-Date Fair Value Nonvested at December 31, 2016 47,970 $ 12.31 Granted — — Vested (14,469 ) 12.31 Forfeited/expired (10,046 ) 12.31 Nonvested at December 31, 2017 23,455 $ 12.31 As of December 31, 2017 , there was approximately $258,000 of total unrecognized compensation cost related to nonvested stock-based compensation arrangements granted under the Plans. The cost is expected to be recognized over a weighted-average period of 1.0 years . There were no stock options granted during the twelve months period ended December 31, 2017 and December 31, 2016. Restricted Stock Awards: On August 4, 2017, the the Board of Directors of the Company made grants of 27,500 shares of restricted stock under the Company’s 2015 Stock Incentive Plan to certain executives of the Company. The restricted shares of stock, which are subject to the terms of a Restricted Stock Grant Agreement between the Company and each recipient, will fully vest on the fifth anniversary of the grant date. Prior to vesting, the recipient will be entitled to vote the shares and receive dividends, if any, declared by the Company with respect to its common stock. Compensation expense for restricted stock is based on the fair value of the restricted stock awards at the time of the grant, which is equal to the market value of the Company’s common stock on the date of grant. The value of the restricted stock grants that are expected to vest is amortized monthly into compensation expense over the five year vesting period. The restricted shares had a fair value of $24.58 per share on the date of issuance. For the period ended December 31, 2017 , compensation expense of $56,330 was recognized related to non-vested restricted stock awards. There was no compensation expenses related to these awards in 2016. As of December 31, 2017 , there was $619,620 of unrecognized compensation cost related to non-vested restricted stock awards granted under the plan. The following table summarizes activity relating to non-vested restricted stock awards: Number Nonvested at December 31, 2016 — Granted 27,500 Vested — Forfeited/expired — Nonvested at December 31, 2017 27,500

Securities Sold Under Agreement

Securities Sold Under Agreements to Repurchase	12 Months Ended
	Dec. 31, 2017
Securities Sold Under Agreement to Repurchase [Abstract]
Securities Sold Under Agreements to Repurchase	Securities Sold Under Agreements to Repurchase Securities sold under repurchase agreements, which are secured borrowings, generally mature within one to four days from the transaction date. Securities sold under repurchase agreements are reflected at the amount of cash received in connection with the transaction. The Company may be required to provide additional collateral based on the fair value of the underlying securities. The Company monitors the fair value of the underlying securities on a daily basis. At December 31, 2017 and 2016 , the Company had securities sold under agreements to repurchase of $24,054,730 and $26,621,984 , respectively, with commercial checking customers.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Loan Commitments: The Company is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing and depository needs of its customers. These financial instruments include commitments to extend credit and standby letters of credit. Such commitments involve, to varying degrees, elements of credit risk and interest rate risk in excess of the amount recognized in the balance sheets. The majority of all commitments to extend credit are variable rate instruments while the standby letters of credit are primarily fixed rate instruments. The Company's exposure to credit loss is represented by the contractual amount of those instruments. The Company uses the same credit policies in making commitments as it does for on-balance sheet instruments. A summary of the Company's total contractual amount for all off-balance sheet commitments at December 31, 2017 is as follows: Commitments to extend credit 292.8 million Standby letters of credit, issued by the Company 5.5 million Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on management's credit evaluation of the customer. Collateral held varies, but may include accounts receivable, inventory, property and equipment, residential real estate, and income-producing commercial properties. Standby letters of credit issued by the Company are conditional commitments to guarantee the performance of a customer to a third party. Those letters of credit are primarily issued to support public and private borrowing arrangements. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loans to customers. Collateral held varies and is required in instances which the Company deems necessary. At December 31, 2017 and 2016 , the carrying amount of liabilities related to the Company's obligation to perform under standby letters of credit was insignificant. The Company has not been required to perform on any standby letters of credit, and the Company has not incurred any losses on standby letters of credit for the years ended December 31, 2017 and 2016 . Contingencies: In the normal course of business, the Company may become involved in various legal proceedings. In the opinion of management, any liability resulting from such proceedings would not have a material effect on the Company's financial statements.

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2017
Banking and Thrift [Abstract]
Regulatory Matters	ry Capital Requirements: The Company and the Bank are subject to regulatory capital requirements administered by federal banking agencies. Capital adequacy guidelines and, additionally for banks, prompt corrective action regulations, involve quantitative measures of assets, liabilities, and certain off-balance-sheet items calculated under regulatory accounting practices. Capital amounts and classifications are also subject to qualitative judgements by regulators. Failure to meet capital requirements can initiate regulatory action. The final rules implementing Basel Committee on Banking Supervision’s capital guidelines for U.S. banks (Basel III rules) became effective for the Company on January 1, 2015, with full compliance with all of the requirements being phased in over a multi-year schedule, and fully phased in by January 1, 2019. Under Basel III rules, the Company must hold a capital conservation buffer above the adequately capitalized risk‑based capital ratios. The capital conservation buffer is being phased in at the rate of 0.625% per year from 0.0% in 2015 to 2.50% on January 1, 2019. The capital conservation buffer for 2017 is 1.25% and for 2016 is 0.625%. The net unrealized gain or loss on available for sale securities is not included in computing regulatory capital. Management believes as of December 31, 2017, the Company and Bank meet all capital adequacy requirements to which they are subject. Prompt corrective action regulations provide five classifications: well capitalized, adequately capitalized, undercapitalized, significantly undercapitalized, and critically undercapitalized, although these terms are not used to represent overall financial condition. If adequately capitalized, regulatory approval is required to accept brokered deposits. If undercapitalized, capital distributions are limited, as is asset growth and expansion, and capital restoration plans are required. At year end 2017 and 2016, the most recent regulatory notifications categorized both the Company and the Bank as well capitalized under the regulatory framework for prompt corrective action. There are no conditions or events since that notification that management believes have changed the Company's or the Bank's category. Management currently believes, based on internal capital analysis and earnings projections, the Company's and the Bank's capital position is adequate to meet current and future regulatory minimum capital requirements. Regulatory Restrictions on Dividends: Pursuant to Tennessee banking law, the Bank may not, without the prior consent of the Commissioner of the Tennessee Department of Financial Institutions (TDFI), pay any dividends to the Company in a calendar year in excess of the total of the Bank's retained net income for that year plus the retained net income for the preceding two years. During the year ended December 31, 2017 , SmartBank paid no dividends to the Company. As of December 31, 2017 , the Bank could pay approximately $11.5 million of additional dividends to the Company without prior approval of the Commissioner of the TDFI. Regulatory Capital Levels: Actual and required capital levels at December 31, 2017 and 2016 are presented below (dollars in thousands): are Actual Minimum for capital adequacy purposes Minimum to be well capitalized under prompt corrective action provisions (1) Amount Ratio Amount Ratio Amount Ratio December 31, 2017 SmartFinancial, Inc. Total Capital (to Risk-Weighted Assets) $ 163,683 10.98 % $ 119,257 8.00 % Tier 1 Capital (to Risk-Weighted Assets) 157,823 10.59 % 89,442 6.00 % Common Equity Tier 1 Capital (to Risk-Weighted Assets) 157,823 10.59 % 67,082 4.50 % Tier 1 Capital (to Average Assets) 157,823 10.78 % 58,562 4.00 % SmartBank Total Capital (to Risk-Weighted Assets) $ 168,148 11.29 % $ 119,111 8.00 % $ 148,889 10.00 % Tier 1 Capital (to Risk-Weighted Assets) 162,288 10.90 % 89,333 6.00 % 119,111 8.00 % Common Equity Tier 1 Capital (to Risk-Weighted Assets) 162,288 10.90 % 67,000 4.50 % 96,778 6.50 % Tier 1 Capital (to Average Assets) 162,288 11.26 % 57,656 4.00 % 72,070 5.00 % (1) The prompt corrective action provisions are applicable at the Bank level only. Regulatory Capital Levels (continued): Actual Minimum for capital Minimum to be well Amount Ratio Amount Ratio Amount Ratio December 31, 2016 SmartFinancial, Inc. Total Capital (to Risk-Weighted Assets) $ 105,756 11.99 % $ 70,553 8.00 % Tier 1 Capital (to Risk-Weighted Assets) 100,651 11.42 % 52,915 6.00 % Common Equity Tier 1 Capital (to Risk-Weighted Assets) 88,651 10.05 % 39,686 4.50 % Tier 1 Capital (to Average Assets) 100,651 9.81 % 41,052 4.00 % SmartBank Total Capital (to Risk-Weighted Assets) $ 104,705 11.88 % $ 70,535 8.00 % $ 88,169 10.00 % Tier 1 Capital (to Risk-Weighted Assets) 99,600 11.30 % 52,901 6.00 % 70,535 8.00 % Common Equity Tier 1 Capital (to Risk-Weighted Assets) 99,600 11.30 % 39,676 4.50 % 57,310 6.50 % Tier 1 Capital (to Average Assets) 99,600 9.71 % 41,041 4.00 % 51,301 5.00 % (1) The prompt corrective action provisions are applicable at the Bank level only.

Concentrations of Credit Risk

Concentrations of Credit Risk	12 Months Ended
	Dec. 31, 2017
Risks and Uncertainties [Abstract]
Concentration of Credit Risk	Concentrations of Credit Risk The Company originates primarily commercial, residential, and consumer loans to customers in Tennessee, Florida, Georgia and Alabama. The ability of the majority of the Company's customers to honor their contractual loan obligations is dependent on the economy in these areas. Eighty-one percent of the Company's loan portfolio is concentrated in loans secured by real estate, of which a substantial portion is secured by real estate in the Company's primary market areas. Commercial real estate, including commercial construction loans, represented 56 percent of the loan portfolio at December 31, 2017 , and 61 percent of the loan portfolio at December 31, 2016 . Accordingly, the ultimate collectability of the loan portfolio and recovery of the carrying amount of foreclosed assets is susceptible to changes in real estate conditions in the Company's primary market areas. The other concentrations of credit by type of loan are set forth in Note 4. The Bank, as a matter of policy, does not generally extend credit to any single borrower or group of related borrowers in excess of 25% of statutory capital, or approximately $42,325,000.

Fair Value of Assets and Liabil

Fair Value of Assets and Liabilities	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value of Assets and Liabilities	ation of Fair Value: The Company uses fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. In accordance with Fair Value Measurements and Disclosures topic (FASB ASC 820), the fair value of a financial instrument is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value is best determined based upon quoted market prices. However, in many instances, there are no quoted market prices for the Company's various financial instruments. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. Accordingly, the fair value estimates may not be realized in an immediate settlement of the instrument. The fair value guidance provides a consistent definition of fair value, which focuses on exit price in an orderly transaction (that is, not a forced liquidation or distressed sale) between market participants at the measurement date under current market conditions. If there has been a significant decrease in the volume and level of activity for the asset or liability, a change in valuation technique or the use of multiple valuation techniques may be appropriate. In such instances, determining the price at which willing market participants would transact at the measurement date under current market conditions depends on the facts and circumstances and requires the use of significant judgment. The fair value is a reasonable point within the range that is most representative of fair value under current market conditions. Fair Value Hierarchy: In accordance with this guidance, the Company groups its financial assets and financial liabilities generally measured at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. Level 1 - Valuation is based on quoted prices in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. Level 1 assets and liabilities generally include debt and equity securities that are traded in an active exchange market. Valuations are obtained from readily available pricing sources for market transactions involving identical assets or liabilities. Level 2 - Valuation is based on inputs other than quoted prices included within Level I that are observable for the asset or liability, either directly or indirectly. The valuation may be based on quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the asset or liability. Level 3 - Valuation is based on unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which determination of fair value requires significant management judgment or estimation. A financial instrument's categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Fair Value Hierarchy (continued): The following methods and assumptions were used by the Company in estimating fair value disclosures for financial instruments: Cash and Cash Equivalents: For cash and due from banks, interest-bearing deposits, and federal funds sold, the carrying amount is a reasonable estimate of fair value based on the short-term nature of the assets and are considered Level 1 inputs. Securities Available for Sale: Where quoted prices are available in an active market, management classifies the securities within Level 1 of the valuation hierarchy. If quoted market prices are not available, management estimates fair values using pricing models and discounted cash flows that consider standard input factors such as observable market data, benchmark yields, interest rate volatilities, broker/dealer quotes, and credit spreads. Examples of such instruments, which would generally be classified within Level 2 of the valuation hierarchy, including GSE obligations, corporate bonds, and other securities. Mortgage-backed securities are included in Level 2 if observable inputs are available. In certain cases where there is limited activity or less transparency around inputs to the valuation, management classifies those securities in Level 3. Restricted Investments: It is not practicable to determine the fair value of restricted investments due the restrictions placed on its transferability. Loans: For variable-rate loans that reprice frequently and with no significant change in credit risk, fair values are based on carrying values. Fair value for fixed rate loans are estimated using discounted cash flow analyses, using market interest rates for comparable loans. Fair values for nonperforming loans are estimated using discounted cash flow analyses or underlying collateral values, where applicable. These methods are considered Level 3 inputs. Deposits: The fair values disclosed for demand deposits (for example, interest and noninterest checking, savings, and certain types of money market accounts) are, by definition, equal to the amount payable on demand at the reporting date (that is, their carrying amounts) and are considered Level 1 inputs. Fair values for fixed-rate certificates of deposit are estimated using a discounted cash flow calculation that applies market interest rates on comparable instruments to a schedule of aggregated expected monthly maturities on time deposits, and are considered Level 2 inputs. Securities Sold Under Agreement to Repurchase: The carrying value of these liabilities approximates their fair value, and are considered Level 1 inputs. Federal Home Loan Bank Advances and Other Borrowings: The fair value of the FHLB fixed rate borrowings are estimated using discounted cash flows, based on the current incremental borrowing rates for similar types of borrowing arrangements, and are considered Level 2 inputs. Commitments to Extend Credit and Standby Letters of Credit: Because commitments to extend credit and standby letters of credit are made using variable rates and have short maturities, the carrying value and the fair value are immaterial for disclosure. Assets Measured at Fair Value on a Recurring Basis: Assets recorded at fair value on a recurring basis are as follows, in thousands Balance as of Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Other Unobservable Inputs (Level 3) Securities available-for-sale: U.S. Government-sponsored enterprises (GSEs) $ 25,776 $ — $ 25,776 $ — Municipal securities 9,003 — 9,003 — Other debt securities 950 — 950 — Mortgage-backed securities 116,215 — 116,215 — Total securities available-for-sale $ 151,944 $ — $ 151,944 $ — Balance as of Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Other Unobservable Inputs (Level 3) Securities available-for-sale: U.S. Government-sponsored enterprises (GSEs) $ 17,723 $ — $ 17,723 $ — Municipal securities 8,019 — 8,019 — Mortgage-backed securities 103,680 — 103,680 — Total securities available-for-sale $ 129,422 $ — $ 129,422 $ — The Company has no assets or liabilities whose fair values are measured on a recurring basis using Level 3 inputs. Additionally, there were no transfers between Level 1 and Level 2 in the fair value hierarchy. Assets Measured at Fair Value on a Nonrecurring Basis: Under certain circumstances management makes adjustments to fair value for assets and liabilities although they are not measured at fair value on an ongoing basis. The following tables present the financial instruments carried on the consolidated balance sheets by caption and by level in the fair value hierarchy, for which a nonrecurring change in fair value has been recorded (in thousands): Balance as of Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Other Unobservable Inputs (Level 3) Impaired loans $ 769 $ — $ — $ 769 Foreclosed assets 3,254 — — 3,254 Assets Measured at Fair Value on a Nonrecurring Basis (continued): Balance as of Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Other Unobservable Inputs (Level 3) Impaired loans $ 239 $ — $ — $ 239 Foreclosed assets 2,386 — — 2,386 For Level 3 assets measured at fair value on a non-recurring basis as of December 31, 2017 and 2016 , the significant unobservable inputs used in the fair value measurements are presented below. Balance as of Valuation Technique Significant Other Unobservable Input Weighted Average of Input Impaired loans $ 769 Third Party Appraisal Appraisal Discounts 35.5 % Foreclosed assets 3,254 Third Party Appraisal Appraisal Discounts 17.8 % Balance as of Valuation Technique Significant Other Unobservable Input Weighted Average of Input Impaired loans $ 239 Cash Flow Discounted Cash Flow / Appraisal Discounts 2.4 % Foreclosed assets 2,386 Appraisal Appraisal Discounts 12.2 % Impaired Loans: Loans considered impaired under ASC 310-10-35, Receivables , are loans for which, based on current information and events, it is probable that the Company will be unable to collect all principal and interest payments due in accordance with the contractual terms of the loan agreement. Impaired loans can be measured based on the present value of expected payments using the loan’s original effective rate as the discount rate, the loan’s observable market price, or the fair value of the collateral less selling costs if the loan is collateral dependent. The fair value of impaired loans were measured based on the value of the collateral securing these loans or the discounted cash flows of the loans, as applicable. Impaired loans are classified within Level 3 of the fair value hierarchy. Collateral may be real estate and/or business assets including equipment, inventory, and/or accounts receivable. The Company determines the value of the collateral based on independent appraisals performed by qualified licensed appraisers. These appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and the income approach. Appraised values are discounted for costs to sell and may be discounted further based on management’s historical knowledge, changes in market conditions from the date of the most recent appraisal, and/or management’s expertise and knowledge of the customer and the customer’s business. Such discounts by management are subjective and are typically significant unobservable inputs for determining fair value. Impaired loans are reviewed and evaluated on at least a quarterly basis for additional impairment and adjusted accordingly, based on the same factors discussed above. Assets Measured at Fair Value on a Nonrecurring Basis (continued): Foreclosed assets: Foreclosed assets, consisting of properties obtained through foreclosure or in satisfaction of loans, are initially recorded at fair value less estimated costs to sell upon transfer of the loans to other real estate. Subsequently, other real estate is carried at the lower of carrying value or fair value less costs to sell. Fair values are generally based on third party appraisals of the property and are classified within Level 3 of the fair value hierarchy. The appraisals are sometimes further discounted based on management’s historical knowledge, and/or changes in market conditions from the date of the most recent appraisal, and/or management’s expertise and knowledge of the customer and the customer’s business. Such discounts are typically significant unobservable inputs for determining fair value. In cases where the carrying amount exceeds the fair value, less estimated costs to sell, a loss is recognized in noninterest expense. Carrying value and estimated fair value: The carrying amount and estimated fair value of the Company’s financial instruments at December 31, 2017 and December 31, 2016 are as follows (in thousands): December 31, 2017 December 31, 2016 Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value Assets: Cash and cash equivalents $ 113,027 $ 113,027 $ 68,748 $ 68,748 Securities available for sale 151,944 151,944 129,422 129,422 Restricted investments 6,431 N/A 5,628 N/A Loans, net 1,317,398 1,292,303 808,271 803,057 Liabilities: Noninterest-bearing demand deposits 220,520 220,520 153,483 153,483 Interest-bearing demand deposits 231,644 231,644 162,702 162,702 Savings deposits 543,645 543,645 274,605 274,605 Time deposits 442,774 443,547 316,275 316,734 Securities sold under agreements to repurchase 24,055 24,055 26,622 26,622 Federal Home Loan Bank advances and other borrowings 43,600 43,600 18,505 18,505 Limitations Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time the Company’s entire holdings of a particular financial instrument. Because no market exists for a significant portion of the Company’s financial instruments, fair value estimates are based on many judgments. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in assumptions could significantly affect the estimates. Fair value estimates are based on existing on and off-balance sheet financial instruments without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments. Significant assets and liabilities that are not considered financial instruments include deferred income taxes and premises and equipment. In addition, the tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on fair value estimates and have not been considered in the estimates.

Small Business Lending Fund

Small Business Lending Fund	12 Months Ended
	Dec. 31, 2017
Small Business Lending Fund [Abstract]
Small Business Lending Fund	Small Business Lending Fund In connection with the Company's merger with Legacy SmartFinancial, Inc. in 2015, the Company assumed Legacy SmartFinancial's obligations under a stock purchase agreement with the U.S. Department of the Treasury and issued 12,000 shares of preferred stock at $1,000 per share under the Small Business Lending Fund Program (the "SBLF Program").The Company paid cash dividends at a one percent rate or $120,000 for the year ended December 31, 2015 on the preferred shares. On February 4, 2016 the dividend rate for the preferred shares increased to nine percent and as a result the Company incurred preferred stock dividends of $1,022,000 for the year ended December 31, 2016 . On January 30, 2017, the Company completed a public offering of 2,010,084 million shares of its common stock, par value $1.00 per share, with the gross proceeds to the Company of approximately $33.2 million . On March 6, 2017, the Company used proceeds from the offering to redeem the $12 million of preferred stock and pay the $195 thousand accrued dividend.

Concentration in Deposits

Concentration in Deposits	12 Months Ended
	Dec. 31, 2017
Risks and Uncertainties [Abstract]
Concentration In Deposits	Concentration in Deposits The Company had a concentration in its deposits of two customers totaling approximately $60,153,000 at December 31, 2016 and three customers totaling approximately $116,121,000 concentration of deposits at December 31, 2017 .

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Basic earnings per share is computed by dividing net income available to common stockholders by the weighted average number of common shares outstanding. Diluted earnings per share is computed by dividing net income available to common shareholders by the weighted average number of common shares outstanding and dilutive common share equivalents using the treasury stock method. Dilutive common share equivalents include common shares issuable upon exercise of outstanding stock options and restricted stock. The effect from the stock options on incremental shares from the assumed conversions for net income per share-basic and net income per share-diluted are presented below. There were antidilutive shares of 13,166 and 17,649 for the years ended December 31, 2017 and 2016 , respectively. (Dollars in thousands, except share amounts) 2017 2016 Basic earnings per share computation: Net income available to common stockholders $ 4,820 $ 4,777 Average common shares outstanding – basic 8,639,212 5,838,574 Basic earnings per share $ 0.56 $ 0.82 Diluted earnings per share computation: Net income available to common stockholders $ 4,820 $ 4,777 Average common shares outstanding – basic 8,639,212 5,838,574 Incremental shares from assumed conversions: Stock options 154,315 280,369 Average common shares outstanding - diluted 8,793,527 6,118,943 Diluted earnings per share $ 0.55 $ 0.78

Condensed Parent Information

Condensed Parent Information	12 Months Ended
	Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Parent Information	(Dollars in thousands) CONDENSED BALANCE SHEETS December 31, December 31, 2017 2016 ASSETS Cash $ 3,936 $ 2,068 Investment in subsidiaries 168,104 100,023 Other assets 42,766 4,392 Total assets $ 214,806 $ 106,483 LIABILITIES AND STOCKHOLDERS’ EQUITY Other liabilities $ (1,046 ) $ 1,243 Other borrowings 10,000 — Total liabilities 8,954 1,243 Stockholders’ equity 205,852 105,240 Total liabilities and stockholders’ equity $ 214,806 $ 106,483 CONDENSED STATEMENTS OF INCOME Years Ended December 31, 2017 2016 INCOME Dividends $ — $ 3,000 Interest income — — — 3,000 EXPENSES Interest expense 69 17 Other operating expenses 2,657 1,146 (Loss) income before equity in undistributed earnings of subsidiaries and income tax benefit (2,726 ) 1,837 Equity in undistributed earnings of subsidiaries 7,134 3,520 Income tax benefit 607 442 Net income 5,015 5,799 Preferred stock dividend requirements 195 1,022 Net income available to common stockholders $ 4,820 $ 4,777 STATEMENTS OF CASH FLOWS Years Ended December 31, 2017 2016 CASH FLOWS FROM OPERATING ACTIVITIES Net income $ 5,015 $ 5,799 Adjustments to reconcile net income to net cash (used in) provided by operating activities: Equity in undistributed income of subsidiary (7,134 ) (3,520 ) Other (2,449 ) 1,234 Net cash (used in) provided by operating activities (4,568 ) 3,513 CASH FLOWS FROM FINANCING ACTIVITIES Proceeds from issuance of note payable 10,000 — Repayment of note payable — (2,000 ) Redemption of preferred stock (12,000 ) — Proceeds from issuance of common stock 37,853 804 Payment of dividends on preferred stock (195 ) (752 ) Net cash provided by (used in) financing activities 35,658 (1,948 ) CASH FLOWS FROM INVESTING ACTIVITIES Net cash for purchase of Capstone Bancshares, Inc. (14,222 ) — Capital injection in subsidiary (15,000 ) Net cash used in investing activities (29,222 ) — NET INCREASE IN CASH AND CASH EQUIVALENTS 1,868 1,565 CASH AND CASH EQUIVALENTS, beginning of year 2,068 503 CASH AND CASH EQUIVALENTS, end of year $ 3,936 $ 2,068

Summary of Significant Accoun28

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Nature of Business	Nature of Business: SmartFinancial, Inc. (the " Company ") is a bank holding company whose principal activity is the ownership and management of its wholly-owned subsidiary, SmartBank (the " Bank "). The Company provides a variety of financial services to individuals and corporate customers through its offices in Tennessee, Alabama, Florida, and Georgia. The Company's primary deposit products are interest-bearing demand deposits and certificates of deposit. Its primary lending products are commercial, residential, and consumer loans.
Basis of Presentation and Accounting Estimates	Basis of Presentation and Accounting Estimates: The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiary. All significant intercompany balances and transactions have been eliminated in consolidation. In preparing the consolidated financial statements in conformity with accounting principles generally accepted in the United States of America, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet, and reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for loan losses, the valuation of foreclosed assets and deferred taxes, other than temporary impairments of securities, and the fair value of financial instruments. The determination of the adequacy of the allowance for loan losses is based on estimates that are particularly susceptible to significant changes in the economic environment and market conditions. In connection with the determination of the estimated losses on loans, management obtains independent appraisals for significant collateral. The Company's loans are generally secured by specific items of collateral including real property, consumer assets, and business assets. Although the Company has a diversified loan portfolio, a substantial portion of its debtors' ability to honor their contracts is dependent on local economic conditions. While management uses available information to recognize losses on loans, further reductions in the carrying amounts of loans may be necessary based on changes in local economic conditions. In addition, regulatory agencies, as an integral part of their examination process, periodically review the estimated losses on loans. Such agencies may require the Company to recognize additional losses based on their judgments about information available to them at the time of their examination. Because of these factors, it is reasonably possible that the estimated losses on loans may change materially in the near term. The Company has evaluated subsequent events for potential recognition and/or disclosure in the consolidated financial statements and accompanying notes included in this Annual Report through the date of the issued consolidated financial statements.
Cash and Cash Equivalents	Cash and Cash Equivalents: For purposes of reporting consolidated cash flows, cash and due from banks includes cash on hand, cash items in process of collection and amounts due from banks. Cash and cash equivalents also includes interest-bearing deposits in banks and federal funds sold. Cash flows from loans, federal funds sold, securities sold under agreements to repurchase and deposits are reported net. Cash and Cash Equivalents (continued): The Bank is required to maintain average balances in cash or on deposit with the Federal Reserve Bank. The reserve requirement was $16,546,000 and $15,208,000 at December 31, 2017 and 2016 , respectively. The Company places its cash and cash equivalents with other financial institutions and limits the amount of credit exposure to any one financial institution. From time to time, the balances at these financial institutions exceed the amount insured by the Federal Deposit Insurance Corporation. The Company has not experienced any losses on these accounts and management considers this to be a normal business risk.
Securities	Securities: Management has classified all securities as available for sale. Securities available for sale are recorded at fair value, with unrealized gains and losses excluded from earnings and reported in other comprehensive loss. Purchase premiums and discounts are recognized in interest income using the interest method over the terms of the securities. Gains and losses on the sale of securities are recorded on the trade date and are determined using the specific identification method. The Company evaluates investment securities quarterly for other than temporary impairment using relevant accounting guidance specifying that (a) if the Company does not have the intent to sell a debt security prior to recovery and (b) it is more likely than not that it will not have to sell the debt security prior to recovery, the security would not be considered other than temporarily impaired unless a credit loss has occurred in the security. If management does not intend to sell the security and it is more likely than not that they will not have to sell the security before recovery of the cost basis, management will recognize the credit component of an other-than- temporary impairment of a debt security in earnings and the remaining portion in other comprehensive loss. Securities borrowed or purchased under agreements to resell and securities loaned or sold under agreements to repurchase are treated as collateralized financial transactions. These agreements are recorded at the amount at which the securities were acquired or sold plus accrued interest. It is the Company's policy to take possession of securities purchased under resale agreements. The market value of these securities is monitored, and additional securities are obtained when deemed appropriate to ensure such transactions are adequately collateralized. The Company also monitors its exposure with respect to securities sold under repurchase agreements, and a request for the return of excess securities held by the counterparty is made when deemed appropriate.
Restricted-Investments	Restricted - Investments: The Company is required to maintain an investment in capital stock of various entities. Based on redemption provisions of these entities, the stock has no quoted market value and is carried at cost. At their discretion, these entities may declare dividends on the stock. Management reviews for impairment based on the ultimate recoverability of the cost basis in these stocks.
Loans	Loans: Loans that management has the intent and ability to hold for the foreseeable future or until maturity or pay-off are reported at their outstanding principal balances less deferred fees and costs on originated loans and the allowance for loan losses. Interest income is accrued on the outstanding principal balance. Loan origination fees, net of certain direct origination costs of consumer and installment loans are recognized at the time the loan is placed on the books. Loan origination fees for all other loans are deferred and recognized as an adjustment of the yield over the life of the loan using the straight-line method without anticipating prepayments. The accrual of interest on loans is discontinued when, in management's opinion, the borrower may be unable to meet payments as they become due, or at the time the loan is 90 days past due, unless the loan is well-secured and in the process of collection. Unsecured loans are typically charged off no later than 120 days past due. Past due status is based on contractual terms of the loan. In all cases, loans are placed on nonaccrual or charged-off at an earlier date if collection of principal and interest is considered doubtful. All interest accrued but not collected for loans that are placed on nonaccrual or charged off is reversed against interest income or charged to the allowance, unless management believes that the accrual of interest is recoverable through the liquidation of collateral. Interest income on nonaccrual loans is recognized on the cash basis, until the loans are returned to accrual status. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and the loan has been performing according to the contractual terms for a period of not less than six months.
Acquired Loans	Acquired Loans: Acquired loans are those acquired in business combinations by the Company or Bank. The fair values of acquired loans with evidence of credit deterioration, purchased credit impaired loans (“ PCI loans ”), are recorded net of a nonaccretable discount and accretable discount. Any excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable discount and is recognized in interest income over the remaining life of the loan when there is reasonable expectation about the amount and timing of such cash flows. The difference between contractually required payments at acquisition and the cash flows expected to be collected at acquisition is the nonaccretable discount, which is included in the carrying amount of acquired loans. Subsequent decreases to the expected cash flows will generally result in a provision for loan losses. Subsequent increases in cash flows result in a reversal of the provision for loan losses to the extent of prior charges or a reclassification of the difference from nonaccretable to accretable with a positive impact on the accretable discount. Acquired loans are initially recorded at fair value at acquisition date. Accretable discounts related to certain fair value adjustments are accreted into income over the estimated lives of the loans. The Company accounts for performing loans acquired in the acquisition using the expected cash flows method of recognizing discount accretion based on the acquired loans' expected cash flows. Management recasts the estimate of cash flows expected to be collected on each acquired impaired loan pool periodically. If the present value of expected cash flows for a pool is less than its carrying value, an impairment is recognized by an increase in the allowance for loan losses and a charge to the provision for loan losses. If the present value of expected cash flows for a pool is greater than its carrying value, any previously established allowance for loan losses is reversed and any remaining difference increases the accretable yield which will be taken into interest income over the remaining life of the loan pool. Acquired impaired loans are generally not subject to individual evaluation for impairment and are not reported with impaired loans, even if they would otherwise qualify for such treatment. Purchased performing loans are recorded at fair value, including a credit discount. Credit losses on acquired performing loans are estimated based on analysis of the performing portfolio. Such estimated credit losses are recorded as nonaccretable discounts in a manner similar to purchased impaired loans. The fair value discount other than for credit loss is accreted as an adjustment to yield over the estimated lives of the loans. A provision for loan losses is recorded for any deterioration in these loans subsequent to the acquisition.
Allowance for Loan Losses	Allowance for Loan Losses: The allowance for loan losses is established as losses are estimated to have occurred through a provision for loan losses charged to expense. Loan losses are charged against the allowance when management believes the uncollectibility of a loan balance is confirmed. Confirmed losses are charged off immediately. Subsequent recoveries, if any, are credited to the allowance. The allowance is an amount that management believes will be adequate to absorb estimated losses relating to specifically identified loans, as well as probable credit losses inherent in the balance of the loan portfolio. The allowance for loan losses is evaluated on a regular basis by management and is based upon management's periodic review of the uncollectibility of loans in light of historical experience, the nature and volume of the loan portfolio, overall portfolio quality, review of specific problem loans, current economic conditions that may affect the borrower's ability to pay, estimated value of any underlying collateral and prevailing economic conditions. This evaluation is inherently subjective as it requires estimates that are susceptible to significant revision as more information becomes available. This evaluation does not include the effects of expected losses on specific loans or groups of loans that are related to future events or expected changes in economic conditions. While management uses the best information available to make its evaluation, future adjustments to the allowance may be necessary if there are significant changes in economic conditions. In addition, regulatory agencies, as an integral part of their examination process, periodically review the Company's allowance for loan losses, and may require the Company to make additions to the allowance based on their judgment about information available to them at the time of their examinations. The allowance consists of specific and general components. The specific component relates to loans that are classified as impaired. For impaired loans, an allowance is established when the discounted cash flows, collateral value, or observable market price of the impaired loan is lower than the carrying value of that loan. The general component covers non-impaired loans and is based on the Company's historical loss experience adjusted for other qualitative factors. Other adjustments may be made to the allowance for pools of loans after an assessment of internal or external influences on credit quality that are not fully reflected in the historical loss or risk rating data. Allowance for Loan Losses (continued): An unallocated component may be maintained to cover uncertainties that could affect management's estimate of probable losses. The unallocated component of the allowance reflects the margin of imprecision inherent in the underlying assumptions used in the methodologies for estimating specific and general losses in the portfolio. As part of the risk management program, an independent review is performed on the loan portfolio, which supplements management’s assessment of the loan portfolio and the allowance for loan losses. The result of the independent review is reported directly to the Audit Committee of the Board of Directors. Loans, for which the terms have been modified at the borrower's request, and for which the borrower is experiencing financial difficulties, are considered troubled debt restructurings and classified as impaired. A loan is considered impaired when it is probable, based on current information and events, the Company will be unable to collect all principal and interest payments due in accordance with the contractual terms of the loan agreement. Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest when due. Loans that experience insignificant payment delays and payment shortfalls are not classified as impaired. Impaired loans are measured by either the present value of expected future cash flows discounted at the loan's effective interest rate, the loan's obtainable market price, or the fair value of the collateral if the loan is collateral dependent. Interest on accruing impaired loans is recognized as long as such loans do not meet the criteria for nonaccrual status. Large groups of smaller balance homogeneous loans are collectively evaluated for impairment. The Company's homogeneous loan pools include consumer real estate loans, commercial real estate loans, construction and land development loans, commercial and industrial loans, and consumer and other loans. The general allocations to these loan pools are based on the historical loss rates for specific loan types and the internal risk grade, if applicable, adjusted for both internal and external qualitative risk factors. The qualitative factors considered by management include, among other factors, (1) changes in local and national economic conditions; (2) changes in asset quality; (3) changes in loan portfolio volume; (4) the composition and concentrations of credit; (5) the impact of competition on loan structuring and pricing; (6) the impact of interest rate changes on portfolio risk and (7) effectiveness of the Company's loan policies, procedures and internal controls. The total allowance established for each homogeneous loan pool represents the product of the historical loss ratio adjusted for qualitative factors and the total dollar amount of the loans in the pool.
Troubled Debt Restructurings	Troubled Debt Restructurings: The Company designates loan modifications as troubled debt restructurings ("TDRs") when for economic and legal reasons related to the borrower's financial difficulties, it grants a concession to the borrower that it would not otherwise consider. TDRs can involve loans remaining on nonaccrual, moving to nonaccrual, or continuing on accrual status, depending on the individual facts and circumstances of the borrower. In circumstances where the TDR involves charging off a portion of the loan balance, the Company typically classifies these restructurings as nonaccrual. In connection with restructurings, the decision to maintain a loan that has been restructured on accrual status is based on a current, well documented credit evaluation of the borrower's financial condition and prospects for repayment under the modified terms. This evaluation includes consideration of the borrower's current capacity to pay, which among other things may include a review of the borrower's current financial statements, an analysis of global cash flow sufficient to pay all debt obligations, a debt to income analysis, and an evaluation of secondary sources of payment from the borrower and any guarantors. This evaluation also includes an evaluation of the borrower's current willingness to pay, which may include a review of past payment history, an evaluation of the borrower's willingness to provide information on a timely basis, and consideration of offers from the borrower to provide additional collateral or guarantor support. The credit evaluation also reflects consideration of the borrower's future capacity and willingness to pay, which may include evaluation of cash flow projections, consideration of the adequacy of collateral to cover all principal and interest, and trends indicating improving profitability and collectability of receivables. Restructured nonaccrual loans may be returned to accrual status based on a current, well-documented credit evaluation of the borrower's financial condition and prospects for repayment under the modified terms. This evaluation must include consideration of the borrower's sustained historical repayment for a reasonable period, generally a minimum of six months, prior to the date on which the loan is returned to accrual status.
Foreclosed Assets	Foreclosed Assets: Foreclosed assets acquired through, or in lieu of, loan foreclosure are held for sale and are initially recorded at fair value less selling costs. Any write-down to fair value at the time of transfer to foreclosed assets is charged to the allowance for loan losses. Subsequent to foreclosure, valuations are periodically performed by management and the assets are carried at the lower of carrying amount or fair value less costs to sell. Costs of improvements are capitalized, whereas costs relating to holding foreclosed assets and subsequent write-downs to the value are expensed. The amount of residential real estate where physical possession had been obtained included within foreclosed assets at December 31, 2017 and 2016 was $545,750 and $1,500 , respectively. The amount of residential real estate in process of foreclosure at December 31, 2017 and December 31, 2016 was $0 .
Premises and Equipment	Premises and Equipment: Land is carried at cost. Premises and equipment are carried at cost less accumulated depreciation computed on the straight-line method over the estimated useful lives of the assets or the expected terms of the leases, if shorter. Expected terms include lease option periods to the extent that the exercise of such options is reasonably assured. Maintenance and repairs are expensed as incurred while major additions and improvements are capitalized. Gains and losses on dispositions are included in current operations. Buildings and leasehold improvements 15 - 40 years Furniture and equipment 3-7 years
Goodwill and Intangible Assets	Goodwill and Intangible Assets: Goodwill represents the cost in excess of the fair value of net assets acquired (including identifiable intangibles) in transactions accounted for as business combinations. Goodwill has an indefinite useful life and is evaluated for impairment annually, or more frequently if events and circumstances indicate that the asset might be impaired. FASB ASC 350, Goodwill and Other , regarding testing goodwill for impairment provides an entity the option to first perform a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If an entity does a qualitative assessment and determines that this is the case, or if a qualitative assessment is not performed, it is required to perform additional goodwill impairment testing to identify potential goodwill impairment and measure the amount of goodwill impairment loss to be recognized for that reporting unit (if any). Based on a qualitative assessment, if an entity determines that the fair value of a reporting unit is more than its carrying amount, the two-step goodwill impairment test is not required. The Company performs its annual goodwill impairment test as of December 31 of each year. For 2017 , the results of the qualitative assessment provided no indication of potential impairment. Goodwill will continue to be monitored for triggering events that may indicate impairment prior to the next scheduled annual impairment test. Intangible assets consist of core deposit premiums created as a result of Business Combinations by the Company or Bank where deposits are assumed. The core deposit premium is initially recognized based on a valuation performed as of the consummation date. The core deposit premium is amortized over the average remaining life of the acquired customer deposits. Amortization expense relating to these intangible assets was $346,435 and $305,452 for the years ended December 31, 2017 and 2016 , respectively. The intangible assets were evaluated for impairment as of December 31, 2017 , and based on that evaluation it was determined that there was no impairment.
Transfer of Financial Assets	Transfer of Financial Assets: Transfers of financial assets are accounted for as sales, when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company - put presumptively beyond the reach of the transferor and its creditors, even in bankruptcy or other receivership, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity or the ability to unilaterally cause the holder to return specific assets.
Advertising Costs	Advertising Costs: The Company expenses all advertising costs as incurred. Advertising expense was $637,600 and $615,751 for the years ended December 31, 2017 and 2016 , respectively.
Income Taxes	Income Taxes: The income tax accounting guidance results in two components of income tax expense: current and deferred. Current income tax expense reflects taxes to be paid or refunded for the current period by applying the provisions of the enacted tax law to the taxable income or excess of deductions over revenues. The Company determines deferred income taxes using the liability (or balance sheet) method. Under this method, the net deferred tax asset or liability is based on the tax effects of the differences between the book and tax bases of assets and liabilities, and enacted changes in tax rates and laws are recognized in the period in which they occur. Deferred income tax expense results from changes in deferred tax assets and liabilities between periods. Deferred tax assets are recognized if it is more likely than not, based on the technical merits, that the tax position will be realized or sustained upon examination. The term more likely than not means a likelihood of more than 50 percent; the terms examined and upon examination also include resolution of the related appeals or litigation processes, if any. A tax position that meets the more-likely-than-not recognition threshold is initially and subsequently measured as the largest amount of tax benefit that has a greater than 50 percent likelihood of being realized upon settlement with a taxing authority that has full knowledge of all relevant information. The determination of whether or not a tax position has met the more-likely-than-not recognition threshold considers the facts, circumstances, and information available at the reporting date and is subject to management's judgment. Deferred tax assets may be reduced by deferred tax liabilities and a valuation allowance if, based on the weight of evidence available, it is more likely than not that some portion or all of a deferred tax asset will not be realized.
Stock Compensation Plans	Stock Compensation Plans: At December 31, 2017 , the Company had options outstanding under stock-based compensation plans, which are described in more detail in Note 10. The plans have been accounted for under the accounting guidance (FASB ASC 718, Compensation - Stock Compensation) which requires that the compensation cost relating to share-based payment transactions be recognized in financial statements. That cost will be measured based on the grant date fair value of the equity or liability instruments issued. The stock compensation accounting guidance covers a wide range of share-based compensation arrangements including stock options, restricted share plans, performance-based awards, share appreciation rights, and stock or other stock based awards. The stock compensation accounting guidance requires that compensation cost for all stock awards be calculated and recognized over the employees' service period, generally defined as the vesting period. For awards with graded-vesting, compensation cost is recognized on a straight-line basis over the requisite service period for the entire award. A Black-Scholes model is used to estimate the fair value of stock options, while the market value of the Company's common stock at the date of grant is used for restrictive stock awards and stock grants.
Employee Benefit Plan	Employee Benefit Plan: Employee benefit plan costs are based on the percentage of individual employee's salary, not to exceed the amount that can be deducted for federal income tax purposes.
Variable Interest Entities	Variable interest entities: An entity is referred to as a variable interest entity (VIE) if it meets the criteria outlined in ASC Topic 810, which are: (1) the entity has equity that is insufficient to permit the entity to finance its activities without additional subordinated financial support from other parties or (2) the entity has equity investors that cannot make significant decisions about the entity's operations or that do not absorb the expected losses or receive the expected returns of the entity. A VIE must be consolidated by the Company if it is deemed to be the primary beneficiary of the VIE, which is the party involved with the VIE that has a majority of the expected losses, expected residual returns, or both. At December 31, 2017 , the Company had an investment in Community Advantage Fund, LLC that qualified as an unconsolidated VIE. The Company’s investment in a partnership consists of an equity interest in a lending partnership for the purposes of loaning funds to an unrelated entity. This entity will use the funds to make loans through the SBA Community Advantage loan Initiative. The Company uses the equity method when it owns an interest in a partnership and can exert significant influence over the partnership’s operations. Under the equity method, the Company’s ownership interest in the partnership’s capital is reported as an investment on its consolidated balance sheets in other assets and the Company’s allocable share of the income or loss from the partnership is reported in noninterest income or expense in the consolidated statements of income. The Company ceases recording losses on an investment in partnership when the cumulative losses and distributions from the partnership exceed the carrying amount of the investment and any advances made by the Company. After the Company’s investment in such partnership reaches zero, cash distributions received from these investments are recorded as income.
Comprehensive Income	Comprehensive Income: Accounting principles generally require that recognized revenue, expenses, gains and losses be included in net income. Although certain changes in assets and liabilities, such as unrealized gains and losses on available for sale securities, are reported as a separate component of the equity section of the balance sheet, such items, along with net income, are components of comprehensive income.
Fair Value of Financial Instruments	Fair Value of Financial Instruments: Fair values of financial instruments are estimates using relevant market information and other assumptions, as more fully disclosed in Note 15. Fair value estimates involve uncertainties and matters of significant judgment. Changes in assumptions or in market conditions could significantly affect the estimates.
Business Combinations	Business Combinations: Business combinations are accounted for using the acquisition method of accounting. Under the acquisition method of accounting, acquired assets and assumed liabilities are included with the acquirer's accounts as of the date of acquisition at estimated fair value, with any excess of purchase price over the fair value of the net assets acquired (including identifiable intangible assets) capitalized as goodwill. In the event that the fair value of the net assets acquired exceeds the purchase price, an acquisition gain is recorded for the difference in consolidated statements of income for the period in which the acquisition occurred. An intangible asset is recognized as an asset apart from goodwill when it arises from contractual or other legal rights or if it is capable of being separated or divided from the acquired entity and sold, transferred, licensed, rented or exchanged. In addition, acquisition-related costs and restructuring costs are recognized as period expenses as incurred. Estimates of fair value are subject to refinement for a period not to exceed one year from acquisition date as information relative to acquisition date fair values becomes available.
Earnings Per Common Share	Earnings per common share: Basic earnings per common share represents income available to common stockholders divided by the weighted-average number of common shares outstanding during the period. Diluted earnings per common share reflects additional common shares that would have been outstanding if dilutive potential common shares had been issued, as well as any adjustment to income that would result from the assumed issuance. Potential common shares that may be issued by the Company relate to restricted stock and outstanding stock options and are determined using the treasury stock method
Segment Reporting	Segment Reporting: ASC Topic 280, “Segment Reporting,” provides for the identification of reportable segments on the basis of distinct business units and their financial information to the extent such units are reviewed by an entity’s chief decision maker (which can be an individual or group of management persons). ASC Topic 280 permits aggregation or combination of segments that have similar characteristics. In the Company’s operations, each bank branch is viewed by management as being a separately identifiable business or segment from the perspective of monitoring performance and allocation of financial resources. Although the branches operate independently and are managed and monitored separately, each is substantially similar in terms of business focus, type of customers, products, and services. Accordingly, the Company’s consolidated financial statements reflect the presentation of segment information on an aggregated basis in one reportable segment.
Recently Issued Not Yet Effective Accounting Pronouncements	Recently Issued Not Yet Effective Accounting Pronouncements: The following is a summary of recent authoritative pronouncements not yet in effect that could impact the accounting, reporting, and/or disclosure of financial information by the Company. In January 2016, the FASB issued guidance that primarily affects the accounting for equity investments, financial liabilities under the fair value option, and the presentation and disclosure requirements for financial instruments in ASU No. 2016-1 - Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities . In addition, the FASB clarified guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on available-for-sale debt securities. The guidance will be effective in fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company is evaluating the impact of this update on its financial statements. In February 2016, the FASB issued guidance that requires lessees to recognize almost all leases on their balance sheet as a right-of-use asset and a lease liability in ASU 2016-2: Leases (Topic 842). For income statement purposes, the FASB retained a dual model, requiring leases to be classified as either operating or finance. Classification will be based on criteria that are largely similar to those applied in current lease accounting, but without explicit bright lines. Lessor accounting is similar to the current model, but updated to align with certain changes to the lessee model and the new revenue recognition standard. Existing sale-leaseback guidance, including guidance for real estate, is replaced with a new model applicable to both lessees and lessors. The new guidance will be effective for public business entities for annual periods beginning after December 15, 2018 including interim periods within those fiscal years. The Company is evaluating the impact of this update on its financial statements. In January 2018, the FASB issued ASU 2018-01, Leases (Topic 842) Land Easement Practical Expedient Transition to Topic 842 , an amendment to ASU 2016-2: Leases. The amendments in this Update permit an entity to elect an optional transition practical expedient to not evaluate under Topic 842 land easements that exist or expired before the entity’s adoption of Topic 842 and that were not previously accounted for as leases under Topic 840. An entity that elects this practical expedient should apply the practical expedient consistently to all of its existing or expired land easements that were not previously accounted for as leases under Topic 840. Once an entity adopts Topic 842, it should apply that Topic prospectively to all new (or modified) land easements to determine whether the arrangement should be accounted for as a lease. An entity that does not elect this practical expedient should evaluate all existing or expired land easements in connection with the adoption of the new lease requirements in Topic 842 to assess whether they meet the definition of a lease. An entity should continue to apply its current accounting policy for accounting for land easements that existed before the entity’s adoption of Topic 842. For example, if an entity currently accounts for certain land easements as leases under Topic 840, it should continue to account for those land easements as leases before its adoption of Topic 842. The effective date and transition requirements for the amendments are the same as the effective date and transition requirements in Update 2016-02. Recently Issued Not Yet Effective Accounting Pronouncements (continued): In June 2016, FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments . The ASU changed the credit loss model on financial instruments measured at amortized cost, available for sale securities and certain purchased financial instruments. Credit losses on financial instruments measured at amortized cost will be determined using a current expected credit loss model which requires the Company to measure all expected credit losses for financial instruments held at the reporting date based on historical experience, current conditions, and reasonable supportable forecasts. This replaces the existing incurred loss model and is applicable to the measurement of credit losses on financial assets measured at amortized cost and applies to some off-balance sheet credit exposures. Purchased financial assets with more-than-insignificant credit deterioration since origination ("PCD assets" which are currently named "PCI Loans") measured at amortized cost will have an allowance for credit losses established at acquisition as part of the purchase price. Subsequent increases or decreases to the allowance for credit losses on PCD assets will be recognized in the income statement. Interest income should be recognized on PCD assets based on the effective interest rate, determined excluding the discount attributed to credit losses at acquisition. Credit losses relating to available-for-sale debt securities will be recognized through an allowance for credit losses. The amount of the credit loss is limited to the amount by which fair value is below amortized cost of the available-for-sale debt security. The amendments in this update are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years for the Company and other SEC filers. Early adoption is permitted and if early adopted, all provisions must be adopted in the same period. The amendments should be applied through a cumulative-effect adjustment to retained earnings as of the beginning of the period adopted. A prospective approach is required for securities with other than temporary impairment recognized prior to adoption. The Company is still reviewing the impact the adoption of this guidance will have on its financial statements. In January 2017, FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment . The ASU simplifies the subsequent measurement of goodwill and eliminates Step 2 from the goodwill impairment test. The Company should perform its goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An impairment charge should be recognized for the amount by which the carrying amount exceeds the reporting unit's fair value. The impairment charge is limited to the amount of goodwill allocated to that reporting unit. The amendments in this update are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for goodwill impairment tests performed on testing dates after January 1, 2017. The Company does not expect these amendments to have a material effect on its financial statements. In January 2017, FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business . The ASU clarifies the definition of a business to assist with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The amendments in this update are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company does not expect these amendments to have a material effect on its financial statements. In March 2017, FASB issued ASU No. 2017-08, Receivables - Nonrefundable Fees and Other Costs (Topic 310-20): Premium Amortization on Purchased Callable Debt Securities. The ASU shortens the amortization period for certain callable debt securities held at a premium. The premium on individual callable debt securities shall be amortized to the earliest call date. This guidance does not apply to securities for which prepayments are estimated on a large number of similar loans where prepayments are probable and reasonably estimable. The amendments in this update are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. This update should be adopted on a modified retrospective basis with a cumulative-effect adjustment to retained earnings on the date of adoption. The Company does not expect these amendments to have a material effect on its financial statements. In August 2017, the FASB issued ASU 2017-12, Targeted Improvements to Accounting for Hedging Activities , which amends the hedge accounting recognition and presentation requirements in Accounting Standards Codification (ASC) 815, Derivatives and Hedging. The goals of the ASU are to (1) improve the transparency and understandability of information conveyed to financial statement users about an entity’s risk management activities by better aligning the entity’s financial reporting for hedging relationships with those risk management activities and (2) reduce the complexity of and simplify the application of hedge accounting by preparers. The amendments will be effective for the Company for interim and annual periods beginning after December 15, 2018. The Company does not expect these amendments to have a material effect on its financial statements. Recently Issued Not Yet Effective Accounting Pronouncements (continued): In May 2014, the FASB issued guidance to change the recognition of revenue from contracts with customers in ASU No. 2014-9, Revenue from Contracts with Customers (Topic 606) . The core principle of the new guidance is that an entity should recognize revenue to reflect the transfer of goods and services to customers in an amount equal to the consideration the entity receives or expects to receive. The guidance will be effective for the Company for annual periods beginning after December 15, 2017, and interim periods within annual reporting periods beginning after December 15, 2017. The Company will apply the guidance using a full retrospective approach. The Company does not expect these amendments to have a material effect on its financial statements.

Business Combination (Tables)

Business Combination (Tables)	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Schedule of Business Acquisitions, by Acquisition	The following table details the financial impact of the merger, including the calculation of the purchase price, the allocation of the purchase price to the fair values of net assets assumed, and goodwill recognized: Calculation of Purchase Price Shares of SMBK common stock issued to Capstone shareholders as of November 1, 2017 2,908,094 Market price of SMBK common stock on November 1, 2017 $ 23.49 Estimated fair value of SMBK common stock issued (in thousands) 68,311 Estimated fair value of Capstone stock options (in thousands) 1,585 Cash consideration paid 15,826 Total consideration (in thousands) $ 85,722 Allocation of Purchase Price (in thousands) Total consideration above $ 85,722 Fair value of assets acquired and liabilities assumed: Cash and cash equivalents 16,810 Investment securities available for sale 51,638 Restricted investments 1,049 Loans 413,023 Premises and equipment 8,668 Bank owned life insurance 10,031 Core deposit intangible 5,530 Other real estate owned 410 Prepaid and other assets 6,360 Deposits (454,154 ) FHLB advances and other borrowings (4,887 ) Payables and other liabilities (6,803 ) Total fair value of net assets acquired 47,675 Goodwill $ 38,047 The following table details the financial impact of the transaction, including the allocation of the purchase price to the fair values of net assets assumed and goodwill recognized: Allocation of Purchase Price (in thousands) Total consideration in cash $ 1,183 Fair value of assets acquired and liabilities assumed: Cash and cash equivalents 133 Loans 24,073 Premises and equipment 2,839 Core deposit intangible 310 Prepaid and other assets 77 Deposits (26,888 ) Payables and other liabilities (21 ) Total fair value of net assets acquired 523 Goodwill $ 660

Securities (Tables)

Securities (Tables)	12 Months Ended
	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Available-for-sale Securities	The amortized cost and fair value of securities available-for-sale at December 31, 2017 and 2016 are summarized as follow (in thousands): December 31, 2017 Amortized Gross Gross Fair U.S. Government-sponsored enterprises (GSEs) $ 26,207 $ 1 $ (432 ) $ 25,776 Municipal securities 9,122 28 (147 ) 9,003 Other debt securities 974 — (24 ) 950 Mortgage-backed securities 117,263 136 (1,184 ) 116,215 Total $ 153,566 $ 165 $ (1,787 ) $ 151,944 December 31, 2016 Amortized Gross Gross Fair U.S. Government-sponsored enterprises (GSEs) $ 18,279 $ 8 $ (564 ) $ 17,723 Municipal securities 8,182 16 (179 ) 8,019 Mortgage-backed securities 104,585 185 (1,090 ) 103,680 Total $ 131,046 $ 209 $ (1,833 ) $ 129,422
Schedule Of Available For Sale Securities and Held To Maturity Reconciliation	The amortized cost and estimated market value of securities at December 31, 2017 , by contractual maturity, are shown below (in thousands). Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Amortized Fair Due in one year or less $ 2,174 $ 2,175 Due from one year to five years 21,606 21,292 Due from five years to ten years 8,037 7,822 Due after ten years 4,486 4,440 36,303 35,729 Mortgage-backed securities 117,263 116,215 Total $ 153,566 $ 151,944
Investments Classified by Contractual Maturity Date	The following tables present the gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities available-for-sale have been in a continuous unrealized loss position, as of December 31, 2017 and 2016 (in thousands): As of December 31, 2017 Less than 12 Months 12 Months or Greater Total Fair Gross Fair Gross Fair Gross U.S. Government- sponsored enterprises (GSEs) $ 1,358 $ (1 ) $ 13,420 $ (431 ) $ 14,778 $ (432 ) Municipal securities 3,418 (43 ) 2,112 (104 ) 5,530 (147 ) Other debt securities 950 (24 ) — — 950 (24 ) Mortgage-backed securities 61,332 (407 ) 35,048 (777 ) 96,380 (1,184 ) Total $ 67,058 $ (475 ) $ 50,580 $ (1,312 ) $ 117,638 $ (1,787 ) As of December 31, 2016 Less than 12 Months 12 Months or Greater Total Fair Gross Fair Gross Fair Gross U.S. Government- sponsored enterprises (GSEs) $ 14,702 $ (564 ) $ — $ — $ 14,702 $ (564 ) Municipal securities 6,368 (179 ) — — 6,368 (179 ) Mortgage-backed securities 67,063 (690 ) 8,948 (400 ) 76,011 (1,090 ) Total $ 88,133 $ (1,433 ) $ 8,948 $ (400 ) $ 97,081 $ (1,833 )
Schedule of Unrealized Loss on Investments	Sales of available for sale securities for the years ended December 31, 2017 and 2016 , were as follows (in thousands): 2017 2016 Proceeds $ 12,614 $ 31,599 Gains realized 145 200 Losses realized 2 —

Loans and Allowance for Loan 31

Loans and Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Impaired Financing Receivables	At December 31, 2017 and 2016 , loans consisted of the following (in thousands): December 31, 2017 December 31, 2016 PCI All Other Total PCI All Other Total Commercial real estate $ 17,903 $ 625,085 $ 642,988 $ 14,943 $ 400,265 $ 415,208 Consumer real estate 7,450 286,007 293,457 9,004 178,798 187,802 Construction and land development 5,120 130,289 135,409 1,678 116,191 117,869 Commercial and industrial 858 237,229 238,087 1,568 83,454 85,022 Consumer and other 1,463 11,854 13,317 — 7,475 7,475 Total loans 32,794 1,290,464 1,323,258 27,193 786,183 813,376 Less: Allowance for loan losses (16 ) (5,844 ) (5,860 ) — (5,105 ) (5,105 ) Loans, net $ 32,778 $ 1,284,620 $ 1,317,398 $ 27,193 $ 781,078 $ 808,271
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period, Carrying Amount of Loans	The composition of loans by loan classification for impaired and performing loan status at December 31, 2017 and 2016 , is summarized in the tables below (amounts in thousands): December 31, 2017 Commercial Consumer Construction Commercial Consumer Total Performing loans $ 624,638 $ 284,585 $ 129,742 $ 237,016 $ 11,842 $ 1,287,823 Impaired loans 447 1,422 547 213 12 2,641 625,085 286,007 130,289 237,229 11,854 1,290,464 PCI loans 17,903 7,450 5,120 858 1,463 32,794 Total $ 642,988 $ 293,457 $ 135,409 $ 238,087 $ 13,317 $ 1,323,258 December 31, 2016 Commercial Consumer Construction Commercial Consumer Total Performing loans $ 400,146 $ 177,977 $ 115,326 $ 83,244 $ 7,475 $ 784,168 Impaired loans 119 821 865 210 — 2,015 400,265 178,798 116,191 83,454 7,475 786,183 PCI loans 14,943 9,004 1,678 1,568 — 27,193 Total loans $ 415,208 $ 187,802 $ 117,869 $ 85,022 $ 7,475 $ 813,376
Past Due Financing Receivables	The following tables show the allowance for loan losses allocation by loan classification for impaired and performing loans as of December 31, 2017 and 2016 (amounts in thousands): December 31, 2017 Construction Commercial Consumer Commercial Consumer and Land and and Real Estate Real Estate Development Industrial Other Total Performing loans $ 2,444 $ 1,340 $ 521 $ 890 $ 204 $ 5,399 PCI loans 16 — — — — 16 Impaired loans 5 256 — 172 12 445 Total $ 2,465 $ 1,596 $ 521 $ 1,062 $ 216 $ 5,860 Credit Risk Management (continued): December 31, 2016 Construction Commercial Consumer Commercial Consumer and Land and and Real Estate Real Estate Development Industrial Other Total Performing loans $ 2,369 $ 1,382 $ 717 $ 516 $ 117 $ 5,101 PCI Loans — — — — — — Impaired loans — — — 4 — 4 Total $ 2,369 $ 1,382 $ 717 $ 520 $ 117 $ 5,105
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period	The following tables detail the changes in the allowance for loan losses for the year ending December 31, 2017 and December 31, 2016 , by loan classification (amounts in thousands): December 31, 2017 Commercial Consumer Construction Commercial Consumer Total Beginning balance $ 2,369 $ 1,382 $ 717 $ 520 $ 117 $ 5,105 Loans charged off — (111 ) — (24 ) (141 ) (276 ) Recoveries of loans charged off 8 99 13 67 61 248 Provision (reallocation) charged to operating expense 88 226 (209 ) 499 179 783 Ending balance $ 2,465 $ 1,596 $ 521 $ 1,062 $ 216 $ 5,860 December 31, 2016 Commercial Consumer Construction Commercial Consumer Total Beginning balance $ 1,906 $ 1,015 $ 627 $ 777 $ 29 $ 4,354 Loans charged off — (102 ) (14 ) (35 ) (155 ) (306 ) Recoveries of loans charged off 45 76 22 58 68 269 Provision (reallocation) charged to operating expense 418 393 82 (280 ) 175 788 Ending balance $ 2,369 $ 1,382 $ 717 $ 520 $ 117 $ 5,105
Troubled Debt Restructurings on Financing Receivables	The following tables outline the amount of each loan classification and the amount categorized into each risk rating as of December 31, 2017 and 2016 (amounts in thousands): Non PCI Loans December 31, 2017 Commercial Consumer Construction Commercial Consumer Total Pass $ 616,028 $ 279,464 $ 129,359 $ 233,942 $ 11,624 $ 1,270,417 Watch 7,673 2,543 383 3,007 62 13,668 Special mention 1,006 2,627 — 64 155 3,852 Substandard 378 1,159 547 157 — 2,241 Doubtful — 214 — 59 13 286 Total $ 625,085 $ 286,007 $ 130,289 $ 237,229 $ 11,854 $ 1,290,464 Credit Risk Management (continued): PCI Loans December 31, 2017 Commercial Consumer Construction Commercial Consumer Total Pass $ 14,386 $ 4,151 $ 4,134 $ 68 $ 819 $ 23,558 Watch 261 1,345 649 120 262 2,637 Special mention — 456 — 58 24 538 Substandard 3,084 1,192 337 588 107 5,308 Doubtful 172 306 — 24 251 753 Total $ 17,903 $ 7,450 $ 5,120 $ 858 $ 1,463 $ 32,794 Total loans $ 642,988 $ 293,457 $ 135,409 $ 238,087 $ 13,317 $ 1,323,258 Non PCI Loans December 31, 2016 Commercial Consumer Construction Commercial Consumer Total Pass $ 399,505 $ 177,466 $ 115,237 $ 82,992 $ 7,238 $ 782,438 Watch 640 550 89 252 — 1,531 Special mention — 104 — — 237 341 Substandard 120 678 865 210 — 1,873 Doubtful — — — — — — Total $ 400,265 $ 178,798 $ 116,191 $ 83,454 $ 7,475 $ 786,183 PCI Loans December 31, 2016 Commercial Consumer Construction Commercial Consumer Total Pass $ 11,836 $ 6,811 $ 1,019 $ 1,507 $ — $ 21,173 Watch 1,045 1,577 645 22 — 3,289 Special mention — — — 12 — 12 Substandard 2,062 616 14 — — 2,692 Doubtful — — — 27 — 27 Total $ 14,943 $ 9,004 $ 1,678 $ 1,568 $ — $ 27,193 Total loans $ 415,208 $ 187,802 $ 117,869 $ 85,022 $ 7,475 $ 813,376
Schedule of Accounts, Notes, Loans and Financing Receivable	The following tables present the aging of the recorded investment in loans and leases as of December 31, 2017 and 2016 (amounts in thousands): December 31, 2017 30-89 Days Past Due 90 Nonaccrual Total PCI Loans Current Total Commercial real estate $ 517 $ 728 $ 128 $ 1,373 $ 17,903 $ 623,712 $ 642,988 Consumer real estate 963 33 991 1,987 7,450 284,020 293,457 Construction and land development 65 326 547 938 5,120 129,351 135,409 Commercial and industrial 286 131 85 502 858 236,727 238,087 Consumer and other 165 291 13 469 1,463 11,385 13,317 Total $ 1,996 $ 1,509 $ 1,764 $ 5,269 $ 32,794 $ 1,285,195 $ 1,323,258 December 31, 2016 30-89 Days Past Due 90 Nonaccrual Total PCI Current Total Commercial real estate $ 395 $ — $ — $ 395 $ 14,943 $ 399,870 $ 415,208 Consumer real estate 695 699 386 1,780 9,004 177,018 187,802 Construction and land development 690 — 865 1,555 1,678 114,636 117,869 Commercial and industrial 257 — 164 421 1,568 83,033 85,022 Consumer and other 17 — — 17 — 7,458 7,475 Total $ 2,054 $ 699 $ 1,415 $ 4,168 $ 27,193 $ 782,015 $ 813,376
Schedule of Allowance for Loan Losses for Impaired and Performing Loans Receivable	The following is an analysis of the impaired loan portfolio detailing the related allowance recorded as of and for the years ended December 31, 2017 and 2016 (amounts in thousands): For the year ended At December 31, 2017 December 31, 2017 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized Impaired loans without a valuation allowance: Non PCI Loans: Commercial real estate $ 424 $ 454 $ — $ 204 $ 44 Consumer real estate 415 420 — 401 16 Construction and land development 547 547 — 628 — Commercial and industrial 41 41 — 44 3 Consumer and other — — — — — 1,427 1,462 — 1,277 63 PCI loans: None in 2017 Impaired loans with a valuation allowance: Non PCI Loans: Commercial real estate 23 23 5 5 1 Consumer real estate 1,007 1,033 256 601 38 Construction and land development — — — — — Commercial and industrial 172 172 172 117 10 Consumer and other 12 13 12 2 1 1,214 1,241 445 725 50 PCI loans: Commercial real estate 16 123 16 3 16 Total impaired loans $ 2,657 $ 2,826 $ 461 $ 2,005 $ 129 Impaired Loans (continued): For the year ended At December 31, 2016 December 31, 2016 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized Impaired loans without a valuation allowance: Non PCI Loans: Commercial real estate $ 119 $ 119 $ — $ 1,311 $ 73 Consumer real estate 821 849 — 2,334 100 Construction and land development 865 865 — 967 3 Commercial and industrial 46 46 — 47 4 Consumer and other — — — — — 1,851 1,879 — 4,659 180 PCI loans: None in 2016 Impaired loans with a valuation allowance: Non PCI Loans: Commercial real estate — — — — — Consumer real estate — — — — — Construction and land development — — — — — Commercial and industrial 164 243 4 306 70 Consumer and other — — — — — 164 243 4 306 70 PCI loans: None in 2016 Total impaired loans $ 2,015 $ 2,122 $ 4 $ 4,965 $ 250
Financing Receivable Credit Quality Indicators	The following table presents a summary of loans that were modified as troubled debt restructurings during the year ended December 31, 2016 (amounts in thousands): December 31, 2016 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Construction and land development 1 $ 278 $ 278 Commercial and industrial 1 164 164
Schedule of Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Movement	The Company has acquired loans which there was, at acquisition, evidence of deterioration of credit quality since origination and it was probable, at acquisition, that all contractually required payments would not be collected. The carrying amount of those loans at for the years ended December 31, 2017 and 2016 is as follows (in thousands): 2017 2016 Commercial real estate $ 23,366 $ 18,473 Consumer real estate 10,764 12,111 Construction and land development 6,285 2,553 Commercial and industrial 1,452 2,482 Consumer and other 1,710 — Total loans $ 43,577 $ 35,619 Less remaining purchase discount (10,783 ) (8,426 ) Total, gross 32,794 27,193 Less: Allowance for loan losses (16 ) — Carrying amount, net of allowance $ 32,778 $ 27,193
Schedule of Financing Receivable Allowance For Credit Losses	Purchased credit impaired loans acquired from Capstone during the year ended December 31, 2017 for which it was probable at acquisition that all contractually required payments would not be collected are as follows (in thousands): 2017 Contractual principal and interest at acquisition $ 25,288 Nonaccretable difference 5,725 Expected cash flows at acquisition 19,563 Accretable yield 2,581 Basis in PCI loans at acquisition-estimated fair value $ 16,982 The following is a summary of the accretable discount on acquired loans for the years ended December 31, 2017 and 2016 (in thousands): 2017 2016 Accretable yield, beginning of period $ 8,950 $ 10,217 Additions 2,581 — Accretion income (4,217 ) (2,588 ) Reclassification from nonaccretable 926 1,585 Other changes, net 1,047 (264 ) Accretable yield, end of period $ 9,287 $ 8,950
Schedule of Loan to Directors, Officers and Affiliated Parties	A summary of activity in loans to related parties is as follows (in thousands): 2017 2016 Balance, beginning of year $ 12,999 $ 10,851 Disbursements 14,533 855 Removal of credit lines — (1,153 ) Changes in ownership — 4,830 Repayments (9,202 ) (2,384 ) Balance, end of year $ 18,330 $ 12,999

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	A summary of premises and equipment at December 31, 2017 and 2016 , is as follows (in thousands): 2017 2016 Land and land improvements $ 10,854 $ 8,354 Building and leasehold improvements 28,576 18,507 Furniture, fixtures and equipment 10,073 7,043 Construction in progress 1,495 2,789 Total, gross 50,998 36,693 Accumulated depreciation (7,998 ) (6,157 ) Total, net $ 43,000 $ 30,536
Property, Plant and Equipment	At December 31, 2017 , the remaining minimum lease payments relating to these leases were as follows (in thousands): 2018 $ 608 2019 500 2020 487 2021 344 2022 124 2023 40

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2017
Deposits [Abstract]
Scheduled Maturities Of Time Deposit	The aggregate amount of time deposits in denominations of $250,000 or more was approximately $171,529,000 and $123,053,000 at December 31, 2017 and 2016 , respectively. At December 31, 2017 , the scheduled maturities of time deposits are as follows (in thousands): 2018 $ 290,093 2019 84,906 2020 36,170 2021 14,353 2022 16,039 Thereafter 120 Total $ 441,681

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-lived Intangible Assets Amortization Expense	The following table presents information about our core deposit premium intangible asset at December 31 (in thousands): 2017 2016 Gross Accumulated Gross Accumulated Amortized intangible asset: Core deposit intangible $ 8,589 $ 626 $ 2,750 $ 280
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	The following table presents information about aggregate amortization expense for 2017 and 2016 and for the succeeding fiscal years as follows (in thousands): 2017 2016 Aggregate amortization expense of core deposit premium intangible $ 346 $ 305
Schedule of Intangible Assets and Goodwill	Estimated aggregate amortization expense of the core deposit premium intangible for the year ending December 31 (in thousands): 2018 $ 772 2019 772 2020 717 2021 670 2022 670 Thereafter 4,362 Total $ 7,963

Income Taxes (Table)

Income Taxes (Table)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Schedule of Effective Income Tax Rate Reconciliation	Income tax expense in the consolidated statements of income for the years ended December 31, 2017 and 2016 , includes the following (in thousands): 2017 2016 Current tax expense Federal $ 1,962 $ 2,503 State 428 531 Deferred tax expense (benefit) related to: Provision for loan losses (355 ) (320 ) Depreciation 374 203 Fair value adjustments 1,611 356 Nonaccrual interest (26 ) (26 ) Foreclosed real estate 55 117 Core deposit intangible (123 ) (117 ) Other 63 115 Change in tax rate 2,440 — Total income tax expense $ 6,429 $ 3,362
Schedule of Deferred Tax Assets and Liabilities	The income tax expense is different from the expected tax expense computed by multiplying income before income tax expense by the statutory income tax rates. The reasons for this difference are as follows (in thousands): 2017 2016 Federal income tax expense computed at the statutory rate $ 3,891 $ 3,115 State income taxes, net of federal tax benefit 491 393 Nondeductible acquisition expenses 364 — Change in tax rate 2,440 — Other (757 ) (146 ) Total income tax expense $ 6,429 $ 3,362
Schedule of Components of Income Tax Expense (Benefit)	The components of the net deferred tax asset as of December 31, 2017 and 2016 , were as follows (in thousands): 2017 2016 Deferred tax assets: Allowance for loan losses $ 1,561 $ 1,932 Fair value adjustments 4,829 3,744 Foreclosed real estate 301 539 Deferred compensation 849 415 State net operating loss carryforward — — Other 849 561 Total deferred tax assets 8,389 7,191 Deferred tax liabilities: Accumulated depreciation 1,194 1,903 Core deposit intangible 1,945 946 Other 223 639 Total deferred tax liabilities 3,362 3,488 Net deferred tax asset $ 5,027 $ 3,703

Federal Home Loan Bank Advanc36

Federal Home Loan Bank Advances and Other Borrowings (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Schedule of Federal Home Loan Bank, Advances, by Branch of FHLB Bank	At December 31, 2016, FHLB advances consisted of the following (amounts in thousands): Long-term advance dated January 10, 2007, requiring monthly interest payments, fixed at 4.25%, with a put option exercisable in January 2008 and then quarterly thereafter, principal due in January 2017 $ 5,000
Scheduled Maturities Of Federal Home Loan Bank Advances and Other Borrowings	At December 31, 2017, scheduled maturities of the Federal Home Loan Bank advances, federal funds purchased of $33,600,000 , and other borrowings are as follows (amounts in thousands): 2018 $33,600 2022 $10,000

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2017
Defined Benefit Plan [Abstract]
Schedule of Share-based Compensation, Stock Options, Activity	A summary of the status of these stock option plans is presented in the following table: Number Weighted Average Exercisable Price Outstanding at December 31, 2016 717,524 $ 10.57 Granted — — Exercised (506,923 ) 9.64 Forfeited (24,496 ) 19.90 Capstone options assumed in business combination 130,469 11.76 Outstanding at December 31, 2017 316,574 $ 11.82 Number Weighted Average Exercisable Price Outstanding at December 31, 2015 817,414 $ 10.62 Granted — — Exercised (89,556 ) 8.98 Forfeited (10,334 ) 28.49 Outstanding at December 31, 2016 717,524 $ 10.57
Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Options Non Vested	Information related to non-vested options for the period ended December 31, 2017 , is as follows: Number Weighted Average Grant-Date Fair Value Nonvested at December 31, 2016 47,970 $ 12.31 Granted — — Vested (14,469 ) 12.31 Forfeited/expired (10,046 ) 12.31 Nonvested at December 31, 2017 23,455 $ 12.31
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range	Information pertaining to options outstanding at December 31, 2017 , is as follows: Options Outstanding Options Exercisable Weighted- Average Remaining Weighted- Average Weighted- Average Exercise Number Contractual Exercise Number Exercise Prices Outstanding Life Price Exercisable Price 6.60 37,500 4.2 years 6.60 37,500 6.60 6.80 16,875 3.2 years 6.80 16,875 6.80 9.48 26,875 5.2 years 9.48 26,875 9.48 9.60 35,625 6.2 years 9.60 35,625 9.60 11.67 2,000 3.1 years 11.67 2,000 11.67 11.76 130,469 1.9 years 11.76 130,469 11.76 14.40 12,805 1.2 years 14.40 12,805 14.40 15.05 41,259 7.8 years 15.05 17,804 15.05 31.96 13,166 0.2 years 31.96 13,166 31.96 Outstanding, end of year 316,574 3.7 years 11.82 293,119 11.56
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity	The following table summarizes activity relating to non-vested restricted stock awards: Number Nonvested at December 31, 2016 — Granted 27,500 Vested — Forfeited/expired — Nonvested at December 31, 2017 27,500

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Other Commitments	A summary of the Company's total contractual amount for all off-balance sheet commitments at December 31, 2017 is as follows: Commitments to extend credit 292.8 million Standby letters of credit, issued by the Company 5.5 million

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2017
Banking and Thrift [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations	Actual and required capital levels at December 31, 2017 and 2016 are presented below (dollars in thousands): are Actual Minimum for capital adequacy purposes Minimum to be well capitalized under prompt corrective action provisions (1) Amount Ratio Amount Ratio Amount Ratio December 31, 2017 SmartFinancial, Inc. Total Capital (to Risk-Weighted Assets) $ 163,683 10.98 % $ 119,257 8.00 % Tier 1 Capital (to Risk-Weighted Assets) 157,823 10.59 % 89,442 6.00 % Common Equity Tier 1 Capital (to Risk-Weighted Assets) 157,823 10.59 % 67,082 4.50 % Tier 1 Capital (to Average Assets) 157,823 10.78 % 58,562 4.00 % SmartBank Total Capital (to Risk-Weighted Assets) $ 168,148 11.29 % $ 119,111 8.00 % $ 148,889 10.00 % Tier 1 Capital (to Risk-Weighted Assets) 162,288 10.90 % 89,333 6.00 % 119,111 8.00 % Common Equity Tier 1 Capital (to Risk-Weighted Assets) 162,288 10.90 % 67,000 4.50 % 96,778 6.50 % Tier 1 Capital (to Average Assets) 162,288 11.26 % 57,656 4.00 % 72,070 5.00 % (1) The prompt corrective action provisions are applicable at the Bank level only. Regulatory Capital Levels (continued): Actual Minimum for capital Minimum to be well Amount Ratio Amount Ratio Amount Ratio December 31, 2016 SmartFinancial, Inc. Total Capital (to Risk-Weighted Assets) $ 105,756 11.99 % $ 70,553 8.00 % Tier 1 Capital (to Risk-Weighted Assets) 100,651 11.42 % 52,915 6.00 % Common Equity Tier 1 Capital (to Risk-Weighted Assets) 88,651 10.05 % 39,686 4.50 % Tier 1 Capital (to Average Assets) 100,651 9.81 % 41,052 4.00 % SmartBank Total Capital (to Risk-Weighted Assets) $ 104,705 11.88 % $ 70,535 8.00 % $ 88,169 10.00 % Tier 1 Capital (to Risk-Weighted Assets) 99,600 11.30 % 52,901 6.00 % 70,535 8.00 % Common Equity Tier 1 Capital (to Risk-Weighted Assets) 99,600 11.30 % 39,676 4.50 % 57,310 6.50 % Tier 1 Capital (to Average Assets) 99,600 9.71 % 41,041 4.00 % 51,301 5.00 %

Fair Value of Assets and Liab40

Fair Value of Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value, by Balance Sheet Grouping	Assets recorded at fair value on a recurring basis are as follows, in thousands Balance as of Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Other Unobservable Inputs (Level 3) Securities available-for-sale: U.S. Government-sponsored enterprises (GSEs) $ 25,776 $ — $ 25,776 $ — Municipal securities 9,003 — 9,003 — Other debt securities 950 — 950 — Mortgage-backed securities 116,215 — 116,215 — Total securities available-for-sale $ 151,944 $ — $ 151,944 $ — Balance as of Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Other Unobservable Inputs (Level 3) Securities available-for-sale: U.S. Government-sponsored enterprises (GSEs) $ 17,723 $ — $ 17,723 $ — Municipal securities 8,019 — 8,019 — Mortgage-backed securities 103,680 — 103,680 — Total securities available-for-sale $ 129,422 $ — $ 129,422 $ —
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation	The following tables present the financial instruments carried on the consolidated balance sheets by caption and by level in the fair value hierarchy, for which a nonrecurring change in fair value has been recorded (in thousands): Balance as of Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Other Unobservable Inputs (Level 3) Impaired loans $ 769 $ — $ — $ 769 Foreclosed assets 3,254 — — 3,254 Assets Measured at Fair Value on a Nonrecurring Basis (continued): Balance as of Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Other Unobservable Inputs (Level 3) Impaired loans $ 239 $ — $ — $ 239 Foreclosed assets 2,386 — — 2,386
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	For Level 3 assets measured at fair value on a non-recurring basis as of December 31, 2017 and 2016 , the significant unobservable inputs used in the fair value measurements are presented below. Balance as of Valuation Technique Significant Other Unobservable Input Weighted Average of Input Impaired loans $ 769 Third Party Appraisal Appraisal Discounts 35.5 % Foreclosed assets 3,254 Third Party Appraisal Appraisal Discounts 17.8 %
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis	The carrying amount and estimated fair value of the Company’s financial instruments at December 31, 2017 and December 31, 2016 are as follows (in thousands): December 31, 2017 December 31, 2016 Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value Assets: Cash and cash equivalents $ 113,027 $ 113,027 $ 68,748 $ 68,748 Securities available for sale 151,944 151,944 129,422 129,422 Restricted investments 6,431 N/A 5,628 N/A Loans, net 1,317,398 1,292,303 808,271 803,057 Liabilities: Noninterest-bearing demand deposits 220,520 220,520 153,483 153,483 Interest-bearing demand deposits 231,644 231,644 162,702 162,702 Savings deposits 543,645 543,645 274,605 274,605 Time deposits 442,774 443,547 316,275 316,734 Securities sold under agreements to repurchase 24,055 24,055 26,622 26,622 Federal Home Loan Bank advances and other borrowings 43,600 43,600 18,505 18,505

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The effect from the stock options on incremental shares from the assumed conversions for net income per share-basic and net income per share-diluted are presented below. There were antidilutive shares of 13,166 and 17,649 for the years ended December 31, 2017 and 2016 , respectively. (Dollars in thousands, except share amounts) 2017 2016 Basic earnings per share computation: Net income available to common stockholders $ 4,820 $ 4,777 Average common shares outstanding – basic 8,639,212 5,838,574 Basic earnings per share $ 0.56 $ 0.82 Diluted earnings per share computation: Net income available to common stockholders $ 4,820 $ 4,777 Average common shares outstanding – basic 8,639,212 5,838,574 Incremental shares from assumed conversions: Stock options 154,315 280,369 Average common shares outstanding - diluted 8,793,527 6,118,943 Diluted earnings per share $ 0.55 $ 0.78

Condensed Parent Information (T

Condensed Parent Information (Tables)	12 Months Ended
	Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Balance Sheet	CONDENSED BALANCE SHEETS December 31, December 31, 2017 2016 ASSETS Cash $ 3,936 $ 2,068 Investment in subsidiaries 168,104 100,023 Other assets 42,766 4,392 Total assets $ 214,806 $ 106,483 LIABILITIES AND STOCKHOLDERS’ EQUITY Other liabilities $ (1,046 ) $ 1,243 Other borrowings 10,000 — Total liabilities 8,954 1,243 Stockholders’ equity 205,852 105,240 Total liabilities and stockholders’ equity $ 214,806 $ 106,483
Condensed Income Statement	CONDENSED STATEMENTS OF INCOME Years Ended December 31, 2017 2016 INCOME Dividends $ — $ 3,000 Interest income — — — 3,000 EXPENSES Interest expense 69 17 Other operating expenses 2,657 1,146 (Loss) income before equity in undistributed earnings of subsidiaries and income tax benefit (2,726 ) 1,837 Equity in undistributed earnings of subsidiaries 7,134 3,520 Income tax benefit 607 442 Net income 5,015 5,799 Preferred stock dividend requirements 195 1,022 Net income available to common stockholders $ 4,820 $ 4,777
Condensed Cash Flow Statement	STATEMENTS OF CASH FLOWS Years Ended December 31, 2017 2016 CASH FLOWS FROM OPERATING ACTIVITIES Net income $ 5,015 $ 5,799 Adjustments to reconcile net income to net cash (used in) provided by operating activities: Equity in undistributed income of subsidiary (7,134 ) (3,520 ) Other (2,449 ) 1,234 Net cash (used in) provided by operating activities (4,568 ) 3,513 CASH FLOWS FROM FINANCING ACTIVITIES Proceeds from issuance of note payable 10,000 — Repayment of note payable — (2,000 ) Redemption of preferred stock (12,000 ) — Proceeds from issuance of common stock 37,853 804 Payment of dividends on preferred stock (195 ) (752 ) Net cash provided by (used in) financing activities 35,658 (1,948 ) CASH FLOWS FROM INVESTING ACTIVITIES Net cash for purchase of Capstone Bancshares, Inc. (14,222 ) — Capital injection in subsidiary (15,000 ) Net cash used in investing activities (29,222 ) — NET INCREASE IN CASH AND CASH EQUIVALENTS 1,868 1,565 CASH AND CASH EQUIVALENTS, beginning of year 2,068 503 CASH AND CASH EQUIVALENTS, end of year $ 3,936 $ 2,068

Summary of Significant Accoun43

Summary of Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Line Items]
Federal Reserve Bank, reserve requirement	$ 16,546,000	$ 15,208,000
Foreclosed assets	3,254,392	2,386,239
Amortization of intangible assets	346,435	305,452
Impairment of intangible assets	0
Advertising Expense	637,600	615,751
Residential Real Estate [Member]
Accounting Policies [Line Items]
Foreclosed assets	545,750	1,500
Mortgage loans in process of foreclosure	$ 0	$ 0
Minimum [Member] | Building and Leasehold Improvements [Member]
Accounting Policies [Line Items]
Useful life	15 years
Minimum [Member] | Furniture and Equipment [Member]
Accounting Policies [Line Items]
Useful life	3 years
Maximum [Member] | Building and Leasehold Improvements [Member]
Accounting Policies [Line Items]
Useful life	40 years
Maximum [Member] | Furniture and Equipment [Member]
Accounting Policies [Line Items]
Useful life	7 years

Business Combination (Details T

Business Combination (Details Textual) - USD ($)	Nov. 01, 2017	May 19, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Total consideration in cash	$ 15,826,000
Ownership interest (as a percent)	74.00%
Pro forma, nonrecurring costs	$ 38,000,000
Pro forma, revenue of acquiree since acquisition date, actual			$ 5,000,000
Pro forma information, earnings (loss) since acquisition date, actual			200,000
Pro forma revenue			24,900,000
Pro forma net income (loss)			947,000
Atlantic Capital Bank, N.A. [Member]
Business Acquisition [Line Items]
Total consideration in cash		$ 1,183,007
Pro forma, revenue of acquiree since acquisition date, actual			903,311
Pro forma information, earnings (loss) since acquisition date, actual			$ 63,385
Capstone Bancshares Inc. [Member]
Business Acquisition [Line Items]
Exchange of shares	0.85
Cash payment per share (in dollars per share)	$ 18.50
Percentage of common stock consideration transferred	80.00%
Percentage of cash consideration transferred	20.00%

Business Combination Business C

Business Combination Business Combination (Allocation of Purchase Price) (Details) - USD ($)	Nov. 01, 2017	May 19, 2017	Aug. 31, 2015
Business Acquisition [Line Items]
Total consideration in cash	$ 15,826,000
Fair value of assets acquired and liabilities assumed:
Cash and cash equivalents	16,810,000
Premises and equipment	8,668,000
Prepaid and other assets	6,360,000
Total fair value of net assets acquired	47,675,000
Goodwill	$ 38,047,000		$ 42,873,689
Atlantic Capital Bank, N.A. [Member]
Business Acquisition [Line Items]
Total consideration in cash		$ 1,183,007
Fair value of assets acquired and liabilities assumed:
Cash and cash equivalents		133,000
Loans		24,073,000
Premises and equipment		2,839,000
Core deposit intangible		310,000
Prepaid and other assets		77,000
Deposits		(26,888,000)
Payables and other liabilities		(21,000)
Total fair value of net assets acquired		523,000
Goodwill		$ 660,000

Business Combination (Details)

Business Combination (Details) - USD ($)	Nov. 01, 2017	Aug. 31, 2015
Business Combinations [Abstract]
Shares of SMBK common stock issued to Capstone shareholders as of November 1, 2017	$ 2,908,094
Market price of SMBK common stock on November 1, 2017	$ 23.49
Estimated fair value of SMBK common stock issued	$ 68,311,000
Estimated fair value of Capstone stock options	1,585,000
Total consideration in cash	15,826,000
Total consideration	85,722,000
Fair value of assets acquired and liabilities assumed:
Cash and cash equivalents	16,810,000
Investment securities available for sale	51,638,000
Restricted investments	1,049,000
Loans	413,023,000
Premises and equipment	8,668,000
Bank owned life insurance	10,031,000
Core deposit intangible	5,530,000
Other real estate owned	410,000
Prepaid and other assets	6,360,000
Deposits	(454,154,000)
FHLB advances and other borrowings	(4,887,000)
Payables and other liabilities	(6,803,000)
Total fair value of net assets acquired	47,675,000
Goodwill	$ 38,047,000	$ 42,873,689

Securities (Details)

Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt securities available-for-sale:
Amortized Cost	$ 153,566	$ 131,046
Gross Unrealized Gains	165	209
Gross Unrealized Losses	(1,787)	(1,833)
Fair Value	151,944	129,422
U.S. Government-sponsored enterprises (GSEs) [Member]
Debt securities available-for-sale:
Amortized Cost	26,207	18,279
Gross Unrealized Gains	1	8
Gross Unrealized Losses	(432)	(564)
Fair Value	25,776	17,723
Muncipal Securities [Member]
Debt securities available-for-sale:
Amortized Cost	9,122	8,182
Gross Unrealized Gains	28	16
Gross Unrealized Losses	(147)	(179)
Fair Value	9,003	8,019
Other Debt Securities [Member]
Debt securities available-for-sale:
Amortized Cost	974
Gross Unrealized Gains	0
Gross Unrealized Losses	(24)
Fair Value	950
Mortgage Backed Securities [Member]
Debt securities available-for-sale:
Amortized Cost	117,263	104,585
Gross Unrealized Gains	136	185
Gross Unrealized Losses	(1,184)	(1,090)
Fair Value	$ 116,215	$ 103,680

Securities (Details 1)

Securities (Details 1) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, Amortized Cost	$ 2,174,000
Due from one year to five years, Amortized Cost	21,606,000
Due from five years to ten years, Amortized Cost	8,037,000
Due after ten years, Amortized Cost	4,486,000
Debt Securities, Amortized Cost	36,303,000
Mortgage-backed securities, Amortized Cost	117,263,000
Amortized Cost	153,566,000	$ 131,046,000
Due in one year or less, Fair Value	2,175,000
Due from one year to five years, Fair Value	21,292,000
Due from five years to ten years, Fair Value	7,822,000
Due after ten years, Fair Value	4,440,000
Debt securities, Fair Value	35,729,000
Mortgage-backed securities, Fair Value	116,215,000
Fair Value	$ 151,944,567	$ 129,421,914

Securities (Details 2)

Securities (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Debt securities available-for-sale:
Less than 12 Months, Fair Value	$ 67,058	$ 88,133
Less than 12 Months, Gross Unrealized Losses	(475)	(1,433)
12 Months or Greater, Fair Value	50,580	8,948
12 Months or Greater, Gross Unrealized Losses	(1,312)	(400)
Total, Fair Value	117,638	97,081
Total, Gross Unrealized Losses	(1,787)	(1,833)
U.S. Government-sponsored enterprises (GSEs) [Member]
Debt securities available-for-sale:
Less than 12 Months, Fair Value	1,358	14,702
Less than 12 Months, Gross Unrealized Losses	(1)	(564)
12 Months or Greater, Fair Value	13,420	0
12 Months or Greater, Gross Unrealized Losses	(431)	0
Total, Fair Value	14,778	14,702
Total, Gross Unrealized Losses	(432)	(564)
Muncipal Securities [Member]
Debt securities available-for-sale:
Less than 12 Months, Fair Value	3,418	6,368
Less than 12 Months, Gross Unrealized Losses	(43)	(179)
12 Months or Greater, Fair Value	2,112	0
12 Months or Greater, Gross Unrealized Losses	(104)	0
Total, Fair Value	5,530	6,368
Total, Gross Unrealized Losses	(147)	(179)
Other Debt Securities [Member]
Debt securities available-for-sale:
Less than 12 Months, Fair Value	950
Less than 12 Months, Gross Unrealized Losses	(24)
12 Months or Greater, Fair Value	0
12 Months or Greater, Gross Unrealized Losses	0
Total, Fair Value	950
Total, Gross Unrealized Losses	(24)
Mortgage Backed Securities [Member]
Debt securities available-for-sale:
Less than 12 Months, Fair Value	61,332	67,063
Less than 12 Months, Gross Unrealized Losses	(407)	(690)
12 Months or Greater, Fair Value	35,048	8,948
12 Months or Greater, Gross Unrealized Losses	(777)	(400)
Total, Fair Value	96,380	76,011
Total, Gross Unrealized Losses	$ (1,184)	$ (1,090)

Securities (Details 3)

Securities (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Proceeds	$ 12,614	$ 31,599
Gains realized	145	200
Losses realized	$ 2	$ 0

Securities (Details Textual)

Securities (Details Textual)	Dec. 31, 2017USD ($)investment	Dec. 31, 2016USD ($)
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities pledged as collateral | $	$ 97,160,059	$ 86,351,097
U.S. Government-sponsored enterprises (GSEs) [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities in unrealized loss positions (Number of investments)	6
Muncipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities in unrealized loss positions (Number of investments)	13
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities in unrealized loss positions (Number of investments)	1
Mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities in unrealized loss positions (Number of investments)	60

Loans and Allowance for Loan 52

Loans and Allowance for Loan Losses (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 1,323,258,000	$ 813,376,000
Less: Allowance for loan losses	(5,860,000)	(5,105,000)	$ (4,354,000)
Loans, net	1,317,397,909	808,271,003
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	642,988,000	415,208,000
Less: Allowance for loan losses	(2,465,000)	(2,369,000)	(1,906,000)
Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	293,457,000	187,802,000
Less: Allowance for loan losses	(1,596,000)	(1,382,000)	(1,015,000)
Construction and Land Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	135,409,000	117,869,000
Less: Allowance for loan losses	(521,000)	(717,000)	(627,000)
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	238,087,000	85,022,000
Less: Allowance for loan losses	(1,062,000)	(520,000)	(777,000)
Consumer and Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	13,317,000	7,475,000
Less: Allowance for loan losses	(216,000)	(117,000)	$ (29,000)
Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	32,794,000	27,193,000
Less: Allowance for loan losses	(16,000)	0
Loans, net	32,778,000	27,193,000
Purchased Credit Impaired Loans [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	17,903,000	14,943,000
Less: Allowance for loan losses	(16,000)	0
Purchased Credit Impaired Loans [Member] | Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	7,450,000	9,004,000
Less: Allowance for loan losses	0	0
Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	5,120,000	1,678,000
Less: Allowance for loan losses	0	0
Purchased Credit Impaired Loans [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	858,000	1,568,000
Less: Allowance for loan losses	0	0
Purchased Credit Impaired Loans [Member] | Consumer and Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,463,000	0
Less: Allowance for loan losses	0	0
All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,290,464,000	786,183,000
Less: Allowance for loan losses	(5,844,000)	(5,105,000)
Loans, net	1,284,620,000	781,078,000
All Other Loans [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	625,085,000	400,265,000
All Other Loans [Member] | Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	286,007,000	178,798,000
All Other Loans [Member] | Construction and Land Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	130,289,000	116,191,000
All Other Loans [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	237,229,000	83,454,000
All Other Loans [Member] | Consumer and Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 11,854,000	$ 7,475,000

Loans and Allowance for Loan 53

Loans and Allowance for Loan Losses (Details 1) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 1,323,258	$ 813,376
All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,290,464	786,183
All Other Loans [Member] | Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,287,823	784,168
All Other Loans [Member] | Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,641	2,015
Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	32,794	27,193
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	642,988	415,208
Commercial Real Estate [Member] | All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	625,085	400,265
Commercial Real Estate [Member] | All Other Loans [Member] | Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	624,638	400,146
Commercial Real Estate [Member] | All Other Loans [Member] | Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	447	119
Commercial Real Estate [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	17,903	14,943
Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	293,457	187,802
Consumer Real Estate [Member] | All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	286,007	178,798
Consumer Real Estate [Member] | All Other Loans [Member] | Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	284,585	177,977
Consumer Real Estate [Member] | All Other Loans [Member] | Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,422	821
Consumer Real Estate [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	7,450	9,004
Construction and Land Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	135,409	117,869
Construction and Land Development [Member] | All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	130,289	116,191
Construction and Land Development [Member] | All Other Loans [Member] | Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	129,742	115,326
Construction and Land Development [Member] | All Other Loans [Member] | Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	547	865
Construction and Land Development [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	5,120	1,678
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	238,087	85,022
Commercial and Industrial [Member] | All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	237,229	83,454
Commercial and Industrial [Member] | All Other Loans [Member] | Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	237,016	83,244
Commercial and Industrial [Member] | All Other Loans [Member] | Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	213	210
Commercial and Industrial [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	858	1,568
Consumer and Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	13,317	7,475
Consumer and Other [Member] | All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	11,854	7,475
Consumer and Other [Member] | All Other Loans [Member] | Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	11,842	7,475
Consumer and Other [Member] | All Other Loans [Member] | Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	12	0
Consumer and Other [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 1,463	$ 0

Loans and Allowance for Loan 54

Loans and Allowance for Loan Losses (Details 2) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 5,860	$ 5,105	$ 4,354
All Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	5,844	5,105
All Other Loans [Member] | Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	5,399	5,101
All Other Loans [Member] | Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	445	4
Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	16	0
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,465	2,369	1,906
Commercial Real Estate [Member] | All Other Loans [Member] | Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,444	2,369
Commercial Real Estate [Member] | All Other Loans [Member] | Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	5	0
Commercial Real Estate [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	16	0
Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,596	1,382	1,015
Consumer Real Estate [Member] | All Other Loans [Member] | Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,340	1,382
Consumer Real Estate [Member] | All Other Loans [Member] | Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	256	0
Consumer Real Estate [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Construction and Land Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	521	717	627
Construction and Land Development [Member] | All Other Loans [Member] | Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	521	717
Construction and Land Development [Member] | All Other Loans [Member] | Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Construction and Land Development [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,062	520	777
Commercial and Industrial [Member] | All Other Loans [Member] | Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	890	516
Commercial and Industrial [Member] | All Other Loans [Member] | Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	172	4
Commercial and Industrial [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Consumer and Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	216	117	$ 29
Consumer and Other [Member] | All Other Loans [Member] | Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	204	117
Consumer and Other [Member] | All Other Loans [Member] | Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	12	0
Consumer and Other [Member] | Purchased Credit Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 0	$ 0

Loans and Allowance for Loan 55

Loans and Allowance for Loan Losses (Details 3) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 5,105,000	$ 4,354,000
Charged-off loans	(276,000)	(306,000)
Recoveries of loans charged off	248,000	269,000
Provision (reallocation) charged to operating expense	782,687	787,545
Ending balance	5,860,000	5,105,000
Commercial Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,369,000	1,906,000
Charged-off loans	0	0
Recoveries of loans charged off	8,000	45,000
Provision (reallocation) charged to operating expense	88,000	418,000
Ending balance	2,465,000	2,369,000
Consumer Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,382,000	1,015,000
Charged-off loans	(111,000)	(102,000)
Recoveries of loans charged off	99,000	76,000
Provision (reallocation) charged to operating expense	226,000	393,000
Ending balance	1,596,000	1,382,000
Construction and Land Development [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	717,000	627,000
Charged-off loans	0	(14,000)
Recoveries of loans charged off	13,000	22,000
Provision (reallocation) charged to operating expense	(209,000)	82,000
Ending balance	521,000	717,000
Commercial and Industrial [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	520,000	777,000
Charged-off loans	(24,000)	(35,000)
Recoveries of loans charged off	67,000	58,000
Provision (reallocation) charged to operating expense	499,000	(280,000)
Ending balance	1,062,000	520,000
Consumer and Other [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	117,000	29,000
Charged-off loans	(141,000)	(155,000)
Recoveries of loans charged off	61,000	68,000
Provision (reallocation) charged to operating expense	179,000	175,000
Ending balance	$ 216,000	$ 117,000

Loans and Allowance for Loan 56

Loans and Allowance for Loan Losses (Details 4) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 1,323,258	$ 813,376
Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	32,794	27,193
Purchased Credit Impaired Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	23,558	21,173
Purchased Credit Impaired Loans [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,637	3,289
Purchased Credit Impaired Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	538	12
Purchased Credit Impaired Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,308	2,692
Purchased Credit Impaired Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	753	27
All Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,290,464	786,183
All Other Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,270,417	782,438
All Other Loans [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	13,668	1,531
All Other Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,852	341
All Other Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,241	1,873
All Other Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	286	0
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	642,988	415,208
Commercial Real Estate [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	17,903	14,943
Commercial Real Estate [Member] | Purchased Credit Impaired Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	14,386	11,836
Commercial Real Estate [Member] | Purchased Credit Impaired Loans [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	261	1,045
Commercial Real Estate [Member] | Purchased Credit Impaired Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial Real Estate [Member] | Purchased Credit Impaired Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,084	2,062
Commercial Real Estate [Member] | Purchased Credit Impaired Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	172	0
Commercial Real Estate [Member] | All Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	625,085	400,265
Commercial Real Estate [Member] | All Other Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	616,028	399,505
Commercial Real Estate [Member] | All Other Loans [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,673	640
Commercial Real Estate [Member] | All Other Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,006	0
Commercial Real Estate [Member] | All Other Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	378	120
Commercial Real Estate [Member] | All Other Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Consumer Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	293,457	187,802
Consumer Real Estate [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,450	9,004
Consumer Real Estate [Member] | Purchased Credit Impaired Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,151	6,811
Consumer Real Estate [Member] | Purchased Credit Impaired Loans [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,345	1,577
Consumer Real Estate [Member] | Purchased Credit Impaired Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	456	0
Consumer Real Estate [Member] | Purchased Credit Impaired Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,192	616
Consumer Real Estate [Member] | Purchased Credit Impaired Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	306	0
Consumer Real Estate [Member] | All Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	286,007	178,798
Consumer Real Estate [Member] | All Other Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	279,464	177,466
Consumer Real Estate [Member] | All Other Loans [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,543	550
Consumer Real Estate [Member] | All Other Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,627	104
Consumer Real Estate [Member] | All Other Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,159	678
Consumer Real Estate [Member] | All Other Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	214	0
Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	135,409	117,869
Construction and Land Development [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,120	1,678
Construction and Land Development [Member] | Purchased Credit Impaired Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,134	1,019
Construction and Land Development [Member] | Purchased Credit Impaired Loans [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	649	645
Construction and Land Development [Member] | Purchased Credit Impaired Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Construction and Land Development [Member] | Purchased Credit Impaired Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	337	14
Construction and Land Development [Member] | Purchased Credit Impaired Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Construction and Land Development [Member] | All Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	130,289	116,191
Construction and Land Development [Member] | All Other Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	129,359	115,237
Construction and Land Development [Member] | All Other Loans [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	383	89
Construction and Land Development [Member] | All Other Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Construction and Land Development [Member] | All Other Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	547	865
Construction and Land Development [Member] | All Other Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	238,087	85,022
Commercial and Industrial [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	858	1,568
Commercial and Industrial [Member] | Purchased Credit Impaired Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	68	1,507
Commercial and Industrial [Member] | Purchased Credit Impaired Loans [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	120	22
Commercial and Industrial [Member] | Purchased Credit Impaired Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	58	12
Commercial and Industrial [Member] | Purchased Credit Impaired Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	588	0
Commercial and Industrial [Member] | Purchased Credit Impaired Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	24	27
Commercial and Industrial [Member] | All Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	237,229	83,454
Commercial and Industrial [Member] | All Other Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	233,942	82,992
Commercial and Industrial [Member] | All Other Loans [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,007	252
Commercial and Industrial [Member] | All Other Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	64	0
Commercial and Industrial [Member] | All Other Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	157	210
Commercial and Industrial [Member] | All Other Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	59	0
Consumer and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	13,317	7,475
Consumer and Other [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,463	0
Consumer and Other [Member] | Purchased Credit Impaired Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	819	0
Consumer and Other [Member] | Purchased Credit Impaired Loans [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	262	0
Consumer and Other [Member] | Purchased Credit Impaired Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	24	0
Consumer and Other [Member] | Purchased Credit Impaired Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	107	0
Consumer and Other [Member] | Purchased Credit Impaired Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	251	0
Consumer and Other [Member] | All Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	11,854	7,475
Consumer and Other [Member] | All Other Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	11,624	7,238
Consumer and Other [Member] | All Other Loans [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	62	0
Consumer and Other [Member] | All Other Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	155	237
Consumer and Other [Member] | All Other Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Consumer and Other [Member] | All Other Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 13	$ 0

Loans and Allowance for Loan 57

Loans and Allowance for Loan Losses (Details 5) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 1,764	$ 1,415
Total Past Due and Nonaccrual	5,269	4,168
Current Loans	1,285,195	782,015
Total loans	1,323,258	813,376
Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	32,794	27,193
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	128	0
Total Past Due and Nonaccrual	1,373	395
Current Loans	623,712	399,870
Total loans	642,988	415,208
Commercial Real Estate [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	17,903	14,943
Consumer Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	991	386
Total Past Due and Nonaccrual	1,987	1,780
Current Loans	284,020	177,018
Total loans	293,457	187,802
Consumer Real Estate [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	7,450	9,004
Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	547	865
Total Past Due and Nonaccrual	938	1,555
Current Loans	129,351	114,636
Total loans	135,409	117,869
Construction and Land Development [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	5,120	1,678
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	85	164
Total Past Due and Nonaccrual	502	421
Current Loans	236,727	83,033
Total loans	238,087	85,022
Commercial and Industrial [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	858	1,568
Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	13	0
Total Past Due and Nonaccrual	469	17
Current Loans	11,385	7,458
Total loans	13,317	7,475
Consumer and Other [Member] | Purchased Credit Impaired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,463	0
30 to 89 Days Past Due and Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	1,996	2,054
30 to 89 Days Past Due and Accruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	517	395
30 to 89 Days Past Due and Accruing [Member] | Consumer Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	963	695
30 to 89 Days Past Due and Accruing [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	65	690
30 to 89 Days Past Due and Accruing [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	286	257
30 to 89 Days Past Due and Accruing [Member] | Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	165	17
Past Due 90 Days or More and Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	1,509	699
Past Due 90 Days or More and Accruing [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	728	0
Past Due 90 Days or More and Accruing [Member] | Consumer Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	33	699
Past Due 90 Days or More and Accruing [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	326	0
Past Due 90 Days or More and Accruing [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	131	0
Past Due 90 Days or More and Accruing [Member] | Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded investment, past due	$ 291	$ 0

Loans and Allowance for Loan 58

Loans and Allowance for Loan Losses (Details 6) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Impaired loans with a valuation allowance, Related Allowance	$ 461
Total impaired loans, Recorded Investment	2,657
Total impaired loans, Unpaid Principal Balance	2,826
Total impaired loans, Average Recorded Investment	2,005
Total impaired loans, Interest Income Recognized	129
All Other Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans without a valuation allowance, Recorded Investment	1,427	$ 1,851
Impaired loans without a valuation allowance, Unpaid Principal Balance	1,462	1,879
Impaired loans without a valuation allowance, Average Recorded Investment	1,277	4,659
Impaired loans without a valuation allowance, Interest Income Recognized	63	180
Impaired loans with a valuation allowance, Recorded Investment	1,214	164
Impaired loans with a valuation allowance, Unpaid Principal Balance	1,241	243
Impaired loans with a valuation allowance, Related Allowance	445	4
Impaired loans with a valuation allowance, Average Recorded Investment	725	306
Impaired loans with a valuation allowance, Interest Income Recognized	50	70
Total impaired loans, Recorded Investment		2,015
Total impaired loans, Unpaid Principal Balance		2,122
Total impaired loans, Average Recorded Investment		4,965
Total impaired loans, Interest Income Recognized		250
All Other Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans without a valuation allowance, Recorded Investment	424	119
Impaired loans without a valuation allowance, Unpaid Principal Balance	454	119
Impaired loans without a valuation allowance, Average Recorded Investment	204	1,311
Impaired loans without a valuation allowance, Interest Income Recognized	44	73
Impaired loans with a valuation allowance, Recorded Investment	23	0
Impaired loans with a valuation allowance, Unpaid Principal Balance	23	0
Impaired loans with a valuation allowance, Related Allowance	5	0
Impaired loans with a valuation allowance, Average Recorded Investment	5	0
Impaired loans with a valuation allowance, Interest Income Recognized	1	0
All Other Loans [Member] | Consumer Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans without a valuation allowance, Recorded Investment	415	821
Impaired loans without a valuation allowance, Unpaid Principal Balance	420	849
Impaired loans without a valuation allowance, Average Recorded Investment	401	2,334
Impaired loans without a valuation allowance, Interest Income Recognized	16	100
Impaired loans with a valuation allowance, Recorded Investment	1,007	0
Impaired loans with a valuation allowance, Unpaid Principal Balance	1,033	0
Impaired loans with a valuation allowance, Related Allowance	256	0
Impaired loans with a valuation allowance, Average Recorded Investment	601	0
Impaired loans with a valuation allowance, Interest Income Recognized	38	0
All Other Loans [Member] | Construction and Land Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans without a valuation allowance, Recorded Investment	547	865
Impaired loans without a valuation allowance, Unpaid Principal Balance	547	865
Impaired loans without a valuation allowance, Average Recorded Investment	628	967
Impaired loans without a valuation allowance, Interest Income Recognized	0	3
Impaired loans with a valuation allowance, Recorded Investment	0	0
Impaired loans with a valuation allowance, Unpaid Principal Balance	0	0
Impaired loans with a valuation allowance, Related Allowance	0	0
Impaired loans with a valuation allowance, Average Recorded Investment	0	0
Impaired loans with a valuation allowance, Interest Income Recognized	0	0
All Other Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans without a valuation allowance, Recorded Investment	41	46
Impaired loans without a valuation allowance, Unpaid Principal Balance	41	46
Impaired loans without a valuation allowance, Average Recorded Investment	44	47
Impaired loans without a valuation allowance, Interest Income Recognized	3	4
Impaired loans with a valuation allowance, Recorded Investment	172	164
Impaired loans with a valuation allowance, Unpaid Principal Balance	172	243
Impaired loans with a valuation allowance, Related Allowance	172	4
Impaired loans with a valuation allowance, Average Recorded Investment	117	306
Impaired loans with a valuation allowance, Interest Income Recognized	10	70
All Other Loans [Member] | Consumer and Other [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans without a valuation allowance, Recorded Investment	0	0
Impaired loans without a valuation allowance, Unpaid Principal Balance	0	0
Impaired loans without a valuation allowance, Average Recorded Investment	0	0
Impaired loans without a valuation allowance, Interest Income Recognized	0	0
Impaired loans with a valuation allowance, Recorded Investment	12	0
Impaired loans with a valuation allowance, Unpaid Principal Balance	13	0
Impaired loans with a valuation allowance, Related Allowance	12	0
Impaired loans with a valuation allowance, Average Recorded Investment	2	0
Impaired loans with a valuation allowance, Interest Income Recognized	1	$ 0
Purchased Credit Impaired Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with a valuation allowance, Recorded Investment	16
Impaired loans with a valuation allowance, Unpaid Principal Balance	123
Impaired loans with a valuation allowance, Related Allowance	16
Impaired loans with a valuation allowance, Average Recorded Investment	3
Impaired loans with a valuation allowance, Interest Income Recognized	$ 16

Loans and Allowance for Loan 59

Loans and Allowance for Loan Losses (Details 7) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	0
Construction and Land Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	1
Pre-Modification Outstanding Recorded Investment	$ 278
Post-Modification Outstanding Recorded Investment	$ 278
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	1
Pre-Modification Outstanding Recorded Investment	$ 164
Post-Modification Outstanding Recorded Investment	$ 164

Loans and Allowance for Loan 60

Loans and Allowance for Loan Losses (Details 8) - Purchased Credit Impaired Loans [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired In Transfer Not Accounted	$ 43,577	$ 35,619
Less remaining purchase discount	(10,783)	(8,426)
Certain Loans Acquired In Transfer	32,794	27,193
Less: Allowance for loan losses	(16)	0
Carrying amount, net of allowance	32,778	27,193
Commercial Real Estate [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired In Transfer Not Accounted	23,366	18,473
Consumer Real Estate [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired In Transfer Not Accounted	10,764	12,111
Construction and Land Development [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired In Transfer Not Accounted	6,285	2,553
Commercial and Industrial [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired In Transfer Not Accounted	1,452	2,482
Consumer and Other [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired In Transfer Not Accounted	$ 1,710	$ 0

Loans and Allowance for Loan 61

Loans and Allowance for Loan Losses (Details 9) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Accretable yield, beginning of period	$ 8,950	$ 10,217
Additions	2,581	0
Accretion income	(4,217)	(2,588)
Reclassification from nonaccretable	926	1,585
Other changes, net	1,047	(264)
Accretable yield, end of period	$ 9,287	$ 8,950

Loans and Allowance for Loan 62

Loans and Allowance for Loan Losses (Details 10) - Capstone Bancshares Inc. [Member] - Purchased Credit Impaired Loans [Member] $ in Thousands	Dec. 31, 2017USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractual principal and interest at acquisition	$ 25,288
Nonaccretable difference	5,725
Expected cash flows at acquisition	19,563
Accretable yield	2,581
Basis in PCI loans at acquisition-estimated fair value	$ 16,982

Loans and Allowance for Loan 63

Loans and Allowance for Loan Losses (Details 11) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Loans and Leases Receivable, Related Parties [Roll Forward]
Balance, beginning of year	$ 12,999	$ 10,851
Disbursements	14,533	855
Removal of credit lines	0	(1,153)
Changes in ownership	0	4,830
Repayments	(9,202)	(2,384)
Balance, end of year	$ 18,330	$ 12,999

Loans and Allowance for Loan 64

Loans and Allowance for Loan Losses (Details Textual)	12 Months Ended
	Dec. 31, 2017USD ($)contract	Dec. 31, 2016USD ($)
Financing Receivable, Modifications [Line Items]
Nonaccrual	$ 1,764,000	$ 1,415,000
Number of Contracts | contract	0
Number of loans modified as troubled debt restructurings with subsequent default | contract	0
Pre-approved unused lines of credit with related parties	$ 5,833,000
Trouble Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructuring	41,000	608,000
Nonaccrual	0	442,000
Purchased Credit Impaired Loans [Member]
Financing Receivable, Modifications [Line Items]
Allowance for loan losses	$ 16,000	$ 0

Premises and Equipment (Details

Premises and Equipment (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Land and land improvements	$ 10,854,000	$ 8,354,000
Building and leasehold improvements	28,576,000	18,507,000
Furniture, fixtures and equipment	10,073,000	7,043,000
Construction in progress	1,495,000	2,789,000
Total, gross	50,998,000	36,693,000
Accumulated depreciation	(7,998,000)	(6,157,000)
Total, net	$ 43,000,249	$ 30,535,594

Premises and Equipment (Detai66

Premises and Equipment (Details 1) $ in Thousands	Dec. 31, 2017USD ($)
Property, Plant and Equipment [Abstract]
2,018	$ 608
2,019	500
2,020	487
2,021	344
2,022	124
2,023	$ 40

Premises and Equipment (Detai67

Premises and Equipment (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Estimated costs to complete construction in progress	$ 3,040,000
Lease expense under the leases	721,534	$ 728,004
Depreciation expense	$ 1,841,524	$ 1,435,090

Deposits (Details)

Deposits (Details) $ in Thousands	Dec. 31, 2017USD ($)
Deposits [Abstract]
2,018	$ 290,093
2,019	84,906
2,020	36,170
2,021	14,353
2,022	16,039
Thereafter	120
Total	$ 441,681

Deposits (Details Textual)

Deposits (Details Textual) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Time Deposits Maturity [Line Items]
Time deposits of 250,000 or more	$ 171,529,000	$ 123,053,000
Fair value adjustments to time deposits	1,092,456	303,981
Deposit liabilities reclassified as loans receivable	155,000	76,380
Related Party [Member]
Time Deposits Maturity [Line Items]
Related party deposit liabilities	$ 16,700,000	$ 15,100,000

Goodwill and Intangible Asset70

Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Amortized intangible asset:
Core deposit intangible, Gross Carrying Amount	$ 8,589	$ 2,750
Core deposit intangible, Accumulated Amortization	$ 626	$ 280

Goodwill and Intangible Asset71

Goodwill and Intangible Assets (Details 1) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Aggregate amortization expense of core deposit premium intangible	$ 346,435	$ 305,452

Goodwill and Intangible Asset72

Goodwill and Intangible Assets (Details 2) $ in Thousands	Dec. 31, 2017USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,018	$ 772
2,019	772
2,020	717
2,021	670
2,022	670
Thereafter	4,362
Total	$ 7,963

Goodwill and Intangible Asset73

Goodwill and Intangible Assets (Details Textual) - USD ($)	Nov. 01, 2017	Aug. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 38,047,000	$ 42,873,689

Income Taxes (Details)

Income Taxes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Current tax expense
Federal	$ 1,962,000	$ 2,503,000
State	428,000	531,000
Deferred tax expense (benefit) related to:
Provision for loan losses	(355,000)	(320,000)
Depreciation	374,000	203,000
Fair value adjustments	1,611,000	356,000
Nonaccrual interest	(26,000)	(26,000)
Foreclosed real estate	55,000	117,000
Core deposit intangible	(123,000)	(117,000)
Other	63,000	115,000
Change in tax rate	2,440,000	0
Total income tax expense	$ 6,428,791	$ 3,362,080

Income Taxes (Details 1)

Income Taxes (Details 1) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal income tax expense computed at the statutory rate	$ 3,891,000	$ 3,115,000
State income taxes, net of federal tax benefit	491,000	393,000
Nondeductible acquisition expenses	364,000	0
Change in tax rate	2,440,000	0
Other	(757,000)	(146,000)
Total income tax expense	$ 6,428,791	$ 3,362,080

Income Taxes (Details 2)

Income Taxes (Details 2) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Allowance for loan losses	$ 1,561	$ 1,932
Fair value adjustments	4,829	3,744
Foreclosed real estate	301	539
Deferred compensation	849	415
State net operating loss carryforward	0	0
Other	849	561
Total deferred tax assets	8,389	7,191
Deferred tax liabilities:
Accumulated depreciation	1,194	1,903
Core deposit intangible	1,945	946
Other	223	639
Total deferred tax liabilities	3,362	3,488
Net deferred tax asset	$ 5,027	$ 3,703

Federal Home Loan Bank Advanc77

Federal Home Loan Bank Advances and Other Borrowings (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Long-term Federal Home Loan Bank Advances	$ 0
Long-term advance dated January 10, 2007, Fixed Interest at 4.25, with a put option exercisable in January 2008 and then quarterly thereafter, principal due in January 2017 [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Long-term Federal Home Loan Bank Advances		$ 5,000,000

Federal Home Loan Bank Advanc78

Federal Home Loan Bank Advances and Other Borrowings (Details 1) $ in Thousands	Dec. 31, 2017USD ($)
Debt Disclosure [Abstract]
2,018	$ 33,600
2,022	$ 10,000

Federal Home Loan Bank Advanc79

Federal Home Loan Bank Advances and Other Borrowings (Details Textual)	12 Months Ended
	Dec. 31, 2017USD ($)	Oct. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Aug. 28, 2015USD ($)
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Long-term line of credit	$ 10,000,000
Carrying value of securities pledged to Federal Home Loan Bank	$ 16,252,434		$ 14,844,441
Interest rate at period end (as a percent)	4.25%
Federal Home Loan Bank borrowings, fair value	$ 0		$ 5,765
Federal funds purchased	33,600,000
Fiscal quarter 2019 [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Amortization	262,500
Fiscal quarter 2020 [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Amortization	287,500
Fiscal Quarter 2021 [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Amortization	312,500
Fiscal Quarter 2022 [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Amortization	$ 337,500
Long-term advance dated January 10, 2007, Fixed Interest at 4.25, with a put option exercisable in January 2008 and then quarterly thereafter, principal due in January 2017 [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal Home Loan Bank, advances, interest rate (as a percent)	4.25%		4.25%
Federal Home Loan Bank Advances [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Line of credit facility, maximum borrowing capacity	$ 36,224,294
Revolving Credit Facility [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Line of credit facility, maximum borrowing capacity		$ 15,000,000		$ 8,000,000
Covenant compliance, ratio of non-performing assets as a percentage total assets, not to be greater than	3.25%
Covenant compliance, Texas ratio, not to be greater than (as a percent)	35.00%
Covenant compliance, liquidity ratio, not to be less than (as a percent)	9.00%
Covenant compliance, liquidity ratio in consecutive quarters, not to be less than (as a percent)	10.00%
Covenant terms, return on average assets, next nine months (as a percent)	0.45%
Covenant terms, return on average assets, thereafter (as a percent)	0.50%
Covenant terms, debt service coverage ratio	0.0125
Covenant compliance, interest coverage ratio, not to be less than	2.50
Revolving Credit Facility [Member] | Prime Rate [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Initial line of credit period	90 days
Variable rate, floor (as a percent)	3.50%
Basis spread on variable rate (as a percent)	(0.25%)
Subsidiaries [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Total risk-based capital ratio required to well-capitalized	10.50%
Tier 1 risk-based capital ratio required to be well capitalized	9.50%
Tier 1 leverage ratio required to be well capitalized	8.00%

Employee Benefit Plans (Details

Employee Benefit Plans (Details Textual) - USD ($)	Aug. 04, 2017	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Deferred compensation arrangements, overall, description		After one year of service the Company matches 100 percent of employee contributions up to 3 percent of compensation and 50 percent of employee contributions on the next 2 percent of compensation.
Share-based compensation expense		$ 97,966	$ 132,635
Options vested in period, fair value		313,977	95,658
Deferred tax expense from stock options exercised		1,331,689	252,931
Options, exercises in period, intrinsic value		5,468,780	$ 660,476
Options, outstanding, intrinsic value		3,261,940
Options, exercisable, intrinsic value		3,105,964
Proceeds from stock options exercised		$ 4,885,646
Number of shares granted		0	0
Weighted average grant-date fair value, granted (in dollars per share)		$ 0
Director [Member]
Defined Benefit Plan Disclosure [Line Items]
Direct stock grant expense		$ 31,791	$ 0
Deferred Salary Reduction Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost recognized		427,975	403,309
Stock Options [Member]
Defined Benefit Plan Disclosure [Line Items]
Unrecognized compensation costs		$ 258,000
Unrecognized compensation costs, period for recognition		11 months 16 days
Stock Appreciation Rights (SARs) [Member]
Defined Benefit Plan Disclosure [Line Items]
Share-based compensation expense		$ 21,829	0
Restricted Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of shares granted		27,500
Legacy Cornerstone Bancshares, Inc. Long-Term Incentive Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Exercise price, not less than (as a percent)		100.00%
Legacy Smart Financial Inc 2010 Incentive Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Exercise price, not less than (as a percent)		100.00%
Number of shares authorized		525,000
Stock Incentive Plan Two Thousand Fifteen [Member]
Defined Benefit Plan Disclosure [Line Items]
Exercise price, not less than (as a percent)		110.00%
Number Outstanding (in shares)		2,000,000
Term of options, no more than		10 years
Voting power held by participant (as a percent)		10.00%
Term of option to participants with more than ten percent voting power		5 years
Percentage Of incentive stock options vesting on second anniversary		30.00%
Percentage Of incentive stock options vesting on third anniversary		30.00%
Percentage Of incentive stock options vesting on fourth anniversary		40.00%
Percentage Of nonqualified stock options vesting on first anniversary		50.00%
Percentage Of nonqualified stock options vesting on second anniversary		50.00%
Stock Incentive Plan Two Thousand Fifteen [Member] | Restricted Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Term of option to participants with more than ten percent voting power		5 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 24.58
Share-based compensation expense		$ 56,330	$ 0
Number of shares granted	27,500
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options		$ 619,620
401 (k) Matching Range One [Member] | Deferred Salary Reduction Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Request service period		1 year
Employer matching contribution, percent of match		100.00%
Employer matching contribution, percent of employees gross pay		3.00%
401 (k) Matching Range Two [Member] | Deferred Salary Reduction Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution, percent of match		50.00%
Employer matching contribution, percent of employees gross pay		2.00%

Employee Benefit Plans (Detai81

Employee Benefit Plans (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Number
Shares, Capstone options assumed in business combination	130,469
Weighted Average Exercisable Price
Weighted Average Exercisable Price, Capstone options assumed in business combination (in dollars per share)	$ 11.76
Officer and Employee Plans [Member]
Number
Shares, Outstanding	717,524	817,414
Shares, Granted	0	0
Shares, Exercised	(506,923)	(89,556)
Shares, Forfeited	(24,496)	(10,334)
Shares, Outstanding	316,574	717,524
Weighted Average Exercisable Price
Weighted Average Exercisable Price, Outstanding (in dollars per share)	$ 10.57	$ 10.62
Weighted Average Exercisable Price Granted (in dollars per share)	0	0
Weighted Average Exercisable Price Exercised (in dollars per share)	9.64	8.98
Weighted Average Exercisable Price Forfeited (in dollars per share)	19.90	28.49
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 11.82	$ 10.57

Employee Benefit Plans (Detai82

Employee Benefit Plans (Details 1) - Officer and Employee Plans [Member] - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices (in dollars per share)	$ 11.82	$ 10.57	$ 10.62
Number Outstanding (in shares)	316,574	717,524	817,414
Options Outstanding, Weighted Average Remaining Life	3 years 8 months 5 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 11.82
Options, Number Exercisable (in shares)	293,119
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 11.56
6.60 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices (in dollars per share)	$ 6.60
Number Outstanding (in shares)	37,500
Options Outstanding, Weighted Average Remaining Life	4 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 6.60
Options, Number Exercisable (in shares)	37,500
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 6.60
6.80 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices (in dollars per share)	$ 6.80
Number Outstanding (in shares)	16,875
Options Outstanding, Weighted Average Remaining Life	3 years 2 months 1 day
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 6.80
Options, Number Exercisable (in shares)	16,875
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 6.80
9.48 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices (in dollars per share)	$ 9.48
Number Outstanding (in shares)	26,875
Options Outstanding, Weighted Average Remaining Life	5 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 9.48
Options, Number Exercisable (in shares)	26,875
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 9.48
9.60 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices (in dollars per share)	$ 9.60
Number Outstanding (in shares)	35,625
Options Outstanding, Weighted Average Remaining Life	6 years 2 months 1 day
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 9.60
Options, Number Exercisable (in shares)	35,625
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 9.60
11.67 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices (in dollars per share)	$ 11.67
Number Outstanding (in shares)	2,000
Options Outstanding, Weighted Average Remaining Life	3 years 29 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 11.67
Options, Number Exercisable (in shares)	2,000
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 11.67
11.76 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices (in dollars per share)	$ 11.76
Number Outstanding (in shares)	130,469
Options Outstanding, Weighted Average Remaining Life	1 year 11 months 5 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 11.76
Options, Number Exercisable (in shares)	130,469
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 11.76
14.40 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices (in dollars per share)	$ 14.40
Number Outstanding (in shares)	12,805
Options Outstanding, Weighted Average Remaining Life	1 year 1 month 28 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 14.40
Options, Number Exercisable (in shares)	12,805
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 14.40
15.05 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices (in dollars per share)	$ 15.05
Number Outstanding (in shares)	41,259
Options Outstanding, Weighted Average Remaining Life	7 years 9 months
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 15.05
Options, Number Exercisable (in shares)	17,804
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 15.05
31.96 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Prices (in dollars per share)	$ 31.96
Number Outstanding (in shares)	13,166
Options Outstanding, Weighted Average Remaining Life	1 month 28 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 31.96
Options, Number Exercisable (in shares)	13,166
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 31.96

Employee Benefit Plans (Detai83

Employee Benefit Plans (Details 2) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Number
Number of Shares, Nonvested, beginning balance	47,970
Number of Shares, Granted	0	0
Number of Shares, Vested	(14,469)
Number of Shares, Forfeited/expired	(10,046)
Number of Shares, Nonvested, ending balance	23,455	47,970
Weighted Average Grant-Date Fair Value
Weighted Average Grant-Date Fair Value, Nonvested, beginning balance (in dollars per share)	$ 12.31
Weighted Average Grant-Date Fair Value, Granted (in dollars per share)	0
Weighted Average Grant-Date Fair Value, Vested (in dollars per share)	12.31
Weighted Average Grant-Date Fair Value, Forfeited/expired (in dollars per share)	12.31
Weighted Average Grant-Date Fair Value, Nonvested, ending balance (in dollars per share)	$ 12.31	$ 12.31

Employee Benefit Plans (Detai84

Employee Benefit Plans (Details 3) - Restricted Stock [Member]	12 Months Ended
	Dec. 31, 2017shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested, beginnning of period (in shares)	0
Granted (in shares)	27,500
Vested (in shares)	0
Forfeited/expired (in shares)	0
Nonvested, end of period (in shares)	27,500

Securities Sold Under Agreeme85

Securities Sold Under Agreements to Repurchase (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	$ 24,054,730	$ 26,621,984
Minimum [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreement to repurchase, maturity of agreement	1 day
Maximum [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreement to repurchase, maturity of agreement	4 days

Commitments and Contingencies86

Commitments and Contingencies (Details) $ in Millions	Dec. 31, 2017USD ($)
Commitments and Contingencies Disclosure [Abstract]
Commitments to extend credit	$ 292.8
Standby letters of credit, issued by the Company	$ 5.5

Regulatory Matters (Details)

Regulatory Matters (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
SmartFinancial, Inc. [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), Actual Amount	$ 163,683	$ 105,756
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	157,823	100,651
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	157,823	88,651
Tier 1 Capital (to Average Assets), Actual Amount	$ 157,823	$ 100,651
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	10.98%	11.99%
Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	10.59%	11.42%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	10.59%	10.05%
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent)	10.78%	9.81%
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	$ 119,257	$ 70,553
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	89,442	52,915
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	67,082	39,686
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Amount	$ 58,562	$ 41,052
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent)	8.00%	8.00%
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent)	6.00%	6.00%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent)	4.50%	4.50%
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Ratio (as a percent)	4.00%	4.00%
Smart Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk-Weighted Assets), Actual Amount	$ 168,148	$ 104,705
Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	162,288	99,600
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Amount	162,288	99,600
Tier 1 Capital (to Average Assets), Actual Amount	$ 162,288	$ 99,600
Total Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	11.29%	11.88%
Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	10.90%	11.30%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Actual Ratio (as a percent)	10.90%	11.30%
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent)	11.26%	9.71%
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	$ 119,111	$ 70,535
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	89,333	52,901
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Amount	67,000	39,676
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Amount	$ 57,656	$ 41,041
Total Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent)	8.00%	8.00%
Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent)	6.00%	6.00%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum for capital adequacy purposes Ratio (as a percent)	4.50%	4.50%
Tier 1 Capital (to Average Assets), Minimum for capital adequacy purposes Ratio (as a percent)	4.00%	4.00%
Total Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount	$ 148,889	$ 88,169
Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount	119,111	70,535
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Amount	96,778	57,310
Tier 1 Capital (to Average Assets), Minimum to be well capitalized under prompt corrective action provisions Amount	$ 72,070	$ 51,301
Total Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Ratio (as a percent)	10.00%	10.00%
Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Ratio (as a percent)	8.00%	8.00%
Common Equity Tier 1 Capital (to Risk-Weighted Assets), Minimum to be well capitalized under prompt corrective action provisions Ratio (as a percent)	6.50%	6.50%
Tier 1 Capital (to Average Assets), Minimum to be well capitalized under prompt corrective action provisions Ratio (as a percent)	5.00%	5.00%

Regulatory Matters (Details Tex

Regulatory Matters (Details Textual)	12 Months Ended
	Dec. 31, 2017USD ($)
Banking and Thrift [Abstract]
Dividends	$ 0
Dividends payable	$ 11,500,000

Concentrations of Credit Risk (

Concentrations of Credit Risk (Details Textual)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Concentration Risk [Line Items]
Credit extending terms to borrowers	The Bank, as a matter of policy, does not generally extend credit to any single borrower or group of related borrowers in excess of 25% of statutory capital, or approximately $42,325,000.
Commercial Real Estate [Member]
Concentration Risk [Line Items]
Concentration risk (as a percent)	56.00%	61.00%
Loan Portfolio Secured by Real Estate [Member]
Concentration Risk [Line Items]
Concentration risk (as a percent)	81.00%

Fair Value of Assets and Liab90

Fair Value of Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale	$ 151,944	$ 129,422
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale	151,944	129,422
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale	0	0
U.S. Government-sponsored enterprises (GSEs) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale	25,776	17,723
U.S. Government-sponsored enterprises (GSEs) [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale	0	0
U.S. Government-sponsored enterprises (GSEs) [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale	25,776	17,723
U.S. Government-sponsored enterprises (GSEs) [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale	0	0
Muncipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale	9,003	8,019
Muncipal Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale	0	0
Muncipal Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale	9,003	8,019
Muncipal Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale	0	0
Other Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale	950
Other Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale	0
Other Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale	950
Other Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale	0
Mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale	116,215	103,680
Mortgage-backed securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale	0	0
Mortgage-backed securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale	116,215	103,680
Mortgage-backed securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale	$ 0	$ 0

Fair Value of Assets and Liab91

Fair Value of Assets and Liabilities (Details 1) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans	$ 769	$ 239
Foreclosed assets	3,254	2,386
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans	0	0
Foreclosed assets	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans	0	0
Foreclosed assets	0	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans	769	239
Foreclosed assets	$ 3,254	$ 2,386

Fair Value of Assets and Liab92

Fair Value of Assets and Liabilities (Details 2) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans	$ 769,000	$ 239,000
Foreclosed assets	$ 3,254,392	$ 2,386,239
Impaired Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Valuation Technique	Third Party Appraisal	Cash Flow
Significant Other Unobservable Input	Appraisal Discounts	Discounted Cash Flow / Appraisal Discounts
Weighted Average of Input (as a percent)	35.50%	2.40%
Foreclosed assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Valuation Technique	Third Party Appraisal	Appraisal
Significant Other Unobservable Input	Appraisal Discounts	Appraisal Discounts
Weighted Average of Input (as a percent)	17.80%	12.20%

Fair Value of Assets and Liab93

Fair Value of Assets and Liabilities (Details 3) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets:
Securities available-for-sale	$ 151,944	$ 129,422
Carrying Value [Member]
Assets:
Cash and cash equivalents	113,027	68,748
Securities available-for-sale		129,422
Restricted investments	6,431	5,628
Loans, net	1,317,398	808,271
Liabilities:
Noninterest-bearing demand deposits	220,520	153,483
Interest-bearing demand deposits	231,644	162,702
Savings deposits	543,645	274,605
Time deposits	442,774	316,275
Securities sold under agreements to repurchase	24,055	26,622
Federal Home Loan Bank advances and other borrowings	43,600	18,505
Estimated Fair Value [Member]
Assets:
Cash and cash equivalents	113,027	68,748
Securities available-for-sale	151,944	129,422
Loans, net	1,292,303	803,057
Liabilities:
Noninterest-bearing demand deposits	220,520	153,483
Interest-bearing demand deposits	231,644	162,702
Savings deposits	543,645	274,605
Time deposits	443,547	316,734
Securities sold under agreements to repurchase	24,055	26,622
Federal Home Loan Bank advances and other borrowings	$ 43,600	$ 18,505

Small Business Lending Fund (De

Small Business Lending Fund (Details Textual) - USD ($)	Mar. 06, 2017	Jan. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2011
Class of Stock [Line Items]
Preferred stock, shares issued			0	12,000
Preferred stock, dividend rate (as a percent)			9.00%		1.00%
Preferred stock dividends			$ 195,000	$ 1,022,000	$ 120,000
Common stock, par value (in dollars per share)			$ 1	$ 1
Proceeds from issuance of common stock			$ 37,852,113	$ 803,957
Payments for redemption of preferred stock	$ 12,000,000
Payment of dividends on preferred stock	$ 195,000		$ 195,000	$ 752,000
SBLF Program [Member]
Class of Stock [Line Items]
Preferred stock, shares issued						12,000
Share price (in dollars per share)						$ 1,000
Common Stock [Member]
Class of Stock [Line Items]
Issuance of common stock in public offering (in shares)		2,010,084
Common stock, par value (in dollars per share)		$ 1
Proceeds from issuance of common stock		$ 33,200,000

Concentration in Deposits (Deta

Concentration in Deposits (Details Textual) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Concentration Risk [Line Items]
Deposits	$ 1,438,582,719	$ 907,065,171
Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Deposits	$ 116,121,000	$ 60,153,000

Earnings per Share (Details)

Earnings per Share (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Anti-dilutive securities excluded from computation of earnings per share (in shares)	13,166	17,649
Basic earnings per share computation:
Net income available to common stockholders	$ 4,820,064	$ 4,776,808
Average common shares outstanding - basic	8,639,212	5,838,574
Basic earnings per share (in dollars per share)	$ 0.56	$ 0.82
Diluted earnings per share computation:
Net income available to common stockholders	$ 4,820,000	$ 4,777,000
Average common shares outstanding - basic	8,639,212	5,838,574
Incremental shares from assumed conversions:
Stock options	154,315	280,369
Average common shares outstanding - diluted	8,793,527	6,118,943
Diluted earnings per share (in dollars per share)	$ 0.55	$ 0.78

Condensed Parent Information (D

Condensed Parent Information (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Cash	$ 113,026,884	$ 68,748,308	$ 79,964,633
Other assets	13,232,247	9,508,899
Total assets	1,720,770,682	1,062,456,285
LIABILITIES AND STOCKHOLDERS’ EQUITY
Total liabilities	1,514,918,842	957,216,145
Stockholders’ equity	205,851,840	105,240,140	100,176,859
Total liabilities and stockholders’ equity	1,720,770,682	1,062,456,285
Parent [Member]
ASSETS
Cash	3,936,000	2,068,000	$ 503,000
Investment in subsidiaries	168,104,000	100,023,000
Other assets	42,766,000	4,392,000
Total assets	214,806,000	106,483,000
LIABILITIES AND STOCKHOLDERS’ EQUITY
Other liabilities	(1,046,000)	1,243,000
Other borrowings	10,000,000	0
Total liabilities	8,954,000	1,243,000
Stockholders’ equity	205,852,000	105,240,000
Total liabilities and stockholders’ equity	$ 214,806,000	$ 106,483,000

Condensed Parent Information 98

Condensed Parent Information (Details 1) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
INCOME
Interest income	$ 52,022,396	$ 42,564,391
EXPENSES
Interest expense	5,693,353	4,299,682
Income tax benefit	(6,428,791)	(3,362,080)
Net income	5,015,064	5,798,808
Preferred stock dividend requirements	195,000	1,022,000	$ 120,000
Net income available to common stockholders	4,820,064	4,776,808
Parent [Member]
INCOME
Dividends	0	3,000,000
Interest income	0	0
Interest and dividend income	0	3,000,000
EXPENSES
Interest expense	69,000	17,000
Other operating expenses	2,657,000	1,146,000
Loss before equity in undistributed earnings of subsidiaries and income tax benefit	(2,726,000)	1,837,000
Equity in undistributed earnings of subsidiaries	7,134,000	3,520,000
Income tax benefit	607,000	442,000
Net income	5,015,000	5,799,000
Preferred stock dividend requirements	195,000	1,022,000
Net income available to common stockholders	$ 4,820,000	$ 4,777,000

Condensed Parent Information 99

Condensed Parent Information (Details 2) - USD ($)	Mar. 06, 2017	Dec. 31, 2017	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income		$ 5,015,064	$ 5,798,808
Adjustments to reconcile net income to net cash used in operating activities:
Other		(102,663)	3,918,803
Net cash provided by operating activities		6,642,301	11,590,741
CASH FLOWS FROM FINANCING ACTIVITIES
Redemption of preferred stock		(12,000,000)	0
Proceeds from issuance of common stock		37,852,113	803,957
Payment of dividends on preferred stock	$ (195,000)	(195,000)	(752,000)
Net cash provided by financing activities		93,772,547	31,506,275
CASH FLOWS FROM INVESTING ACTIVITIES
Net cash used in investing activities		(56,136,272)	(54,313,341)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS		44,278,576	(11,216,325)
CASH AND CASH EQUIVALENTS, beginning of year		68,748,308	79,964,633
CASH AND CASH EQUIVALENTS, end of year		113,026,884	68,748,308
Parent [Member]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income		5,015,000	5,799,000
Adjustments to reconcile net income to net cash used in operating activities:
Equity in undistributed income of subsidiary		(7,134,000)	(3,520,000)
Other		(2,449,000)	1,234,000
Net cash provided by operating activities		(4,568,000)	3,513,000
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from issuance of note payable		10,000,000	0
Repayment of note payable		0	(2,000,000)
Redemption of preferred stock		(12,000,000)	0
Proceeds from issuance of common stock		37,853,000	804,000
Payment of dividends on preferred stock		(195,000)	(752,000)
Net cash provided by financing activities		35,658,000	(1,948,000)
CASH FLOWS FROM INVESTING ACTIVITIES
Net cash for purchase of Capstone Bancshares, Inc.		(14,222,000)	0
Capital injection in subsidiary		(15,000,000)
Net cash used in investing activities		(29,222,000)	0
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS		1,868,000	1,565,000
CASH AND CASH EQUIVALENTS, beginning of year		2,068,000	503,000
CASH AND CASH EQUIVALENTS, end of year		$ 3,936,000	$ 2,068,000